The 17.5 denotes the rim diameter and the 5.5 denotes the width of the rim. 5.5 is very narrow. It looks like the Goodyear is an 8x17.5 which is probably a little wide for the rim. But that tire size is just as obsolete the wheels. A 205/75/17.5 tire would probably work. Budd as well as Firestone and Goodyear manufactured wheels in those days. Some wheels had a center from one manufacturer and a rim from a different manufacturer. And sometimes one manufacturer purchased wheels from another and restamped them with their port number. it was never a very popular size and about the only place I remember seeing them was on motor homes. Budd is a generic word sometimes used for all disc type wheels but usually it is for stud piloted ball and seat. Budd was credited with inventing the stud pilot system which is now obsolete. Budd also manufactured trailers. I still have a 50 year old Budd trailer that I use for storage. The Budd company started declining about 40 years and finally took bankruptcy. I wouldn't be concerned about part numbers. The best way to describe them is 8 hole hub pilot disc type 17.5 wheels 5.5" wide.