According to the 1965 Chevy truck Data Book, No , not from the factory. Widest available were 5 1/2 inch rims. But Special order, which would have been tricky through your dealer, things could be done. My 66 K20 was able to get the 16.5X8 wheels and is well documented. These are 8 lug rims though. I have a 1963 GMC 4x4 that I put factory Chevy 15x8 rims on. But I believe they are later 1973 on up rims. Heres a few pictures of trucks mentioned.
