Yea, I've got the same catalog, in front of me now, page 753. The 5 stud adapter has me kinda confused though. All 400, & most 450 series GMC's, I've seen, that had optional, & standard disc. type wheels, were 6 stud Motor wheels. The 470's were available with 6, & 10 stud Motor, & Budd Wheels. I see where there was also a 6 stud adapter.
