1965-66 Chevy Custom Camper?

[jocko]

Agree, 65's are tricky as the last year before SPIDs became a thing - that build sheet is like gold in any 65 and earlier truck if you're lucky enough to have it still

You could indeed order all the requisite equipment separately that you needed to be able to "select" the Z81 RPO - but if you didn't actually select Z81 RPO when you ordered, well, you had a like-equipped C20, but not a Custom Camper.

If I'm not mistaken, selecting Z81 was a very minor additional fee and, in essence, really only gave the buyer the Custom Camper emblem on the cowl (because he'd have already paid for all the underlying required equipment - or it may be the case that selecting Z81 just added all that equipment automatically - but I'm not aware of any bundle savings to be had by selecting Z81 - just the very minor extra cost for the emblem).