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19.5 gallon capacity per 1966 salesman info book I have.
Take a look-see in the CD and older paper catalogs you have, try and find a 19 1/2 gallon in-cab tank listed prior to 1970. Lotsa luck.
C1TZ-9002-H .. 18 Gallon In-Cab Fuel Tank / Replaced
Original applications: 1961/69 F100/750 / 1963/69 N500/750.
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In 1970, FoMoCo replaced C1TZ-9002-HwithD0TZ-9002-A .. 19 1/2 Gallon In-Cab Fuel Tank for use as a Service Part Replacement.
This tank was also installed in 1970/72 F100/750's.
So, the DOTZ-9002-A applications are: 1961/72 F100/750 & 1963/69 N500/750.
The D0TZ tank has been reproduced (by Blue Oval Truck Parts), is available from all the repop parts sellers.