CivicMinded --- Welcome to FTE!
There are some folks that frequent this site that have much more experience and knowledge than I on deciphering VIN and Warranty Data Plate information, but I'll take a stab at it and if I'm wrong, I'm sure they'll jump in and set me straight:

VIN# = F10JD696572

F10 = truck series code = 2WD, 1/2 ton

J = Engine code = indicates a 240" 6-cylinder, 1 barrel carb

D = Assembly plant code = Dallas, TX

696572 = consecutive build number; built in June, 1965

W.B. = 115 = short wheel base, short box.

Color = L = Holley (dark) Green

Model = F100 = 2WD, 1/2 ton

Body = 381 = I don't know ?? maybe it should read, 'B81' ?? if so, thus, Chassis - Cab, (only 1,852 units of B81 code F100s made) Does your truck have a box or stake rack or ?

Trans = F = 4 speed manual, (however, I don't know which 4-speed, I know there was more than one 4spd offered)

Axle = C5 = is a 4.10:1 rear gear ratio

Max. G.V.W. = 5000 = 5000lbs rated, 5-lug, 5.5" bolt pattern, 9" ring/pinion, std for 1/2 ton

Cert. Net. H.P. = 129 = 240" 6cyl (this was the first year for the 240 cubic inch inline six cylinder. It featured seven main bearings, hydraulic lifters, gear-driven camshaft, and an individual intake and exhaust manifolds).

R.P.M. = 4000 = rpm where HP was measured

D.S.O. = 75 = Domestic Sales Order for Phoenix, AZ; servicing AZ, NM and Western TX


You mentioned you now have 5.5 x 5 x 16.5 wheels. I've never heard of 5-lug 16.5" wheels. Maybe they're 5-lug 17.5" wheels?
The 15" or 16" 5-lug 5.5" bolt pattern wheels were used well into the late 70s, so they shouldn't be too tough to locate a set around down there in AZ.

--- Good Luck!
BarnieTrk