1967 K10 CST Wheel ID?

[mojavetrucker]

I recently picked up a pretty original Silver Poly ‘67 K10 CST. According to the VIN, it’s a 5600 GVW model. The owner’s manual states that the 5600 GVW trucks had the 17.5” wheels. The SPID doesn’t have any wheel & tire options noted. The five wheels on the truck are all Kelsey Hayes #76841, 15 x 8L with 4.25” backspacing and dated 11/67. There is some visible original black paint in places. There are no provisions for caps, but there are holes for clips. None of the five wheels appear to ever have had clips installed. There is no GM stamp.

I’ve read on this site that the ‘67 & ‘68 K10 trucks were delivered new with black wheels and no caps. Was this also true for CST?

I question the originality of the wheels. With an 11/67 manufacturing date, they would seem more suited for a ‘68.

I would like to know your thoughts on the originality of these wheels vs. the 17.5” high clearance wheels…or, did the truck have something entirely different from the factory that were replaced with what appears to be generic K-H wheels?

Thank you…