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I just did mine, 2006 F350, the new drive shaft seal has a metal portion that fits in the drive shaft hole. I installed the hub seal with a black plumbing adaptor. Do not forget to replace the O Ring, this is a must. I will see if I still have the numbers.
Here are the numbers from Ford, price from Ford dealer in Waterville Maine
Shaft seal AC3Z 1S175 A $25.10 New metal seal
O RING 5C3Z 4A322 AA $9.48
HUB SEAL 5C3Z 3254 AA $56.70
I got two more hub seals on E bay for 80 dollars for 2, so check Ebay first
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