You can replace those spring by just removing the pan, you should also replace the accumulator piston and cover too, you my have the "old style" aluminum one, the new style is steel with molded rubber lip seals.
Here is some info I found
1-2 Bottom springs (For use with 1997 and later molded style pistons)
<table style="width: 100%; text-align: left;" border="1" cellpadding="2" cellspacing="2"> <tbody> <tr> <td style="vertical-align: top;">Part Number
</td> <td style="vertical-align: top;">From
</td> <td style="vertical-align: top;">To
</td> <td style="vertical-align: top;">Color
</td> <td style="vertical-align: top;">Comments
</td> <td style="vertical-align: top;">Suggested Retail
(March 2005)
</td> </tr> <tr> <td style="vertical-align: top;">F7AZ-7F284-BA
</td> <td style="vertical-align: top;">1992
</td> <td style="vertical-align: top;">1994
</td> <td style="vertical-align: top;">Violet
</td> <td style="vertical-align: top;">Bottom
</td> <td style="vertical-align: top;">$34.37
</td> </tr> <tr> <td style="vertical-align: top;">F3LY-7F284-A
</td> <td style="vertical-align: top;">1995
</td> <td style="vertical-align: top;">1997
</td> <td style="vertical-align: top;">Purple
</td> <td style="vertical-align: top;">Bottom
</td> <td style="vertical-align: top;">$11.93
</td> </tr> <tr> <td style="vertical-align: top;">F4UZ-7F284-A
</td> <td style="vertical-align: top;">1998
</td> <td style="vertical-align: top;">2000
</td> <td style="vertical-align: top;">Pink
</td> <td style="vertical-align: top;">Bottom
</td> <td style="vertical-align: top;">$4.22
</td> </tr> <tr> <td style="vertical-align: top;">1L3Z-7F284-AA
</td> <td style="vertical-align: top;">2001
</td> <td style="vertical-align: top;">2005
</td> <td style="vertical-align: top;">Dark Blue
</td> <td style="vertical-align: top;">Bottom Inner
</td> <td style="vertical-align: top;">$4.22
</td> </tr> <tr> <td style="vertical-align: top;">1L3Z-7F284-BA
</td> <td style="vertical-align: top;">2001
</td> <td style="vertical-align: top;">2005
</td> <td style="vertical-align: top;">Yellow
</td> <td style="vertical-align: top;">Bottom Outer
</td> <td style="vertical-align: top;">$4.52
</td> </tr> </tbody> </table>
1-2 Upper springs (For use with 1997 and later molded style pistons)
<table style="width: 100%; text-align: left;" border="1" cellpadding="2" cellspacing="2"> <tbody> <tr> <td style="vertical-align: top;">Part Number
</td> <td style="vertical-align: top;">From
</td> <td style="vertical-align: top;">To
</td> <td style="vertical-align: top;">Color
</td> <td style="vertical-align: top;">Comments
</td> <td style="vertical-align: top;">Suggested Retail
</td> </tr> <tr> <td style="vertical-align: top;">
</td> <td style="vertical-align: top;">1992
</td> <td style="vertical-align: top;">1993
</td> <td style="vertical-align: top;">
</td> <td style="vertical-align: top;">Top spring not installed in production
</td> <td style="vertical-align: top;">
</td> </tr> <tr> <td style="vertical-align: top;">F7AZ-7F284-CA
</td> <td style="vertical-align: top;">1994
</td> <td style="vertical-align: top;">1994
</td> <td style="vertical-align: top;">Dark Blue
</td> <td style="vertical-align: top;">Top
</td> <td style="vertical-align: top;">$34.45
</td> </tr> <tr> <td style="vertical-align: top;">F7AZ-7F284-AA
</td> <td style="vertical-align: top;">1995
</td> <td style="vertical-align: top;">1997
</td> <td style="vertical-align: top;">White
</td> <td style="vertical-align: top;">Top
Supercedes: F4UZ-7F284-B
</td> <td style="vertical-align: top;">$4.52
</td> </tr> <tr> <td style="vertical-align: top;">F75Z-7F284-AA
</td> <td style="vertical-align: top;">1998
</td> <td style="vertical-align: top;">2000
</td> <td style="vertical-align: top;">Light Blue
</td> <td style="vertical-align: top;">Top
Supercedes: F3LY-7F284-B
</td> <td style="vertical-align: top;">$4.52
</td> </tr> <tr> <td style="vertical-align: top;">1W7Z-7F284-AA
</td> <td style="vertical-align: top;">2001
</td> <td style="vertical-align: top;">2005
</td> <td style="vertical-align: top;">Light Green
</td> <td style="vertical-align: top;">Top
</td> <td style="vertical-align: top;">$4.28
</td> </tr> <tr> <td style="vertical-align: top;">
</td> <td style="vertical-align: top;">
</td> <td style="vertical-align: top;">
</td> <td style="vertical-align: top;">
</td> <td style="vertical-align: top;">
</td> <td style="vertical-align: top;">
</td> </tr> <tr> <td style="vertical-align: top;">F75Z-7F284-BA
</td> <td style="vertical-align: top;">
</td> <td style="vertical-align: top;">
</td> <td style="vertical-align: top;">
</td> <td style="vertical-align: top;">Top spring used in econoline vans, explorers, mountaineers, and f-150 pickup trucks. Very stiff. Never factory installed in production crown victorias.
</td> <td style="vertical-align: top;">$4.22
</td> </tr> </tbody> </table>
1-2 Accumulator piston and related parts
<table style="width: 100%; text-align: left;" border="1" cellpadding="2" cellspacing="2"> <tbody> <tr> <td style="vertical-align: top;">Part Number
</td> <td style="vertical-align: top;">From
</td> <td style="vertical-align: top;">To
</td> <td style="vertical-align: top;">Comments
</td> <td style="vertical-align: top;">Suggested Retail
</td> </tr> <tr> <td style="vertical-align: top;">F7AZ-7F251-AA
</td> <td style="vertical-align: top;">1997
</td> <td style="vertical-align: top;">2005
</td> <td style="vertical-align: top;">Molded accumulator piston
</td> <td style="vertical-align: top;">$14.48
</td> </tr> <tr> <td style="vertical-align: top;">F4AZ-7F247-A
</td> <td style="vertical-align: top;">1992
</td> <td style="vertical-align: top;">2005
</td> <td style="vertical-align: top;">Accumulator case bore cover
Outer edge contains a rubber seal that may be damaged during removal
</td> <td style="vertical-align: top;">$5.57
</td> </tr> <tr> <td style="vertical-align: top;">F2VY-7384-A
</td> <td style="vertical-align: top;">1992
</td> <td style="vertical-align: top;">2005
</td> <td style="vertical-align: top;">Accumulator case bore cover snap ring
</td> <td style="vertical-align: top;">$2.33
</td> </tr> </tbody> </table>