Here is a copy of the 1964 Chevrolet Truck Specifications Manual

Scroll down to Suburban specifications/models.
It looks like there was one length for all Suburban models.

If you have a panel truck, maybe side windows were added?
Panel Trucks were available in different lengths.

What is the wheelbase-length of your truck?

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In each new thread/topic that you post, please start a new thread and indicate your year/model.
Another moderator (or I) might move this introductory/first post into a new thread.

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Last edited by Gdads51; 06/15/2025 9:47 PM. Reason: replace old inactive link w/active link
Tim
1954Advance-Design.com
1954 3106 Carryall Suburban
1954 3104 5-window pickup w/Hydra-Matic
The 216 and early 235 engines are not "splash oilers" -- this is a splash oiler.