kbenz - From your description of 6 lug rear and 10 lug front wheels for your 1965 C60, it sounds like you must have "Budd Style' wheels as listed in the 1965 Chevrolet Truck Heritage documents (pic below).

We can confirm more once you can post some pictures.

PS - If you email the pictures to yourself, that usually will resize them smaller so you can then try and attach them again.
Attachments

~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)