The GM Heritage center will show you all of the combinations and options. Linked from the LINKS pages or:
https://www.gmheritagecenter.com/.

I think you will find 15 in was standard. 16 was not atypical. 16.5 as well as BC mentions.

Welcome back.
HB


~ HB
1966 Chevrolet K-10 | Ghost: formerly Flappy Fenders | In the Stovebolt Gallery
1962 Chevrolet C10
1962 Suburban