Buddy Buckets Info

[Mieser3]

I recently purchased a 1967 CST long fleetside parts truck with the small back window. This truck has buddy buckets and a friend of mine swears up and down that only big back window cabs were equipped with buddy buckets. That doesn't make any sense to me and I thought I had read somewhere that buddy buckets were standard on 1967 CST's and were an option on the 1968 CST's. Big back window or small back window wasn't related to the buddy buckets option at all was it? Am I correct or is my friend?

Thanks!