Ok, first things first. You do need to look at all the wheels to get the info you got on your Budd #60130. Like was said, wheels get damaged and changed over the years and you need to know exactly what you've got. The other thing about having a mixed set of wheels is the risks associated with mix-matching lock rings and wheels during service. All the dozens of lock ring designs used over the years have subtle differences and rings cannot safely be switched wheel to wheel.
My 1954 Budd catalog shows that your #60130 is, as you've posted, a 20" x 6" having the 6 lug x 8.75" bolt circle in a stud piloted mount. It has a 6 15/32" center bore (hole), and has 5.5" of dish. Recommended tire size is a 7.50", and max size is a 8.25". It has a Goodyear outer lock ring style rim (not a widowmaker) that has the technical design name of "LBW". Don't try to make anything else out of the letters, it's just the name of the design. Please see the 1949 charts in Grigg's tech article for the design. Also here's the LBW from Budd's 1954 catalog in my Photobucket file.
http://i286.photobucket.com/albums/ll89/truckdog62563/Wheel%20Profiles/Budd1954GoodyearLWLBW.jpgBefore looking to go with a 19.5" tubeless I'd suggest keeping your stock 20s if they are safe to use. Next, if they are not, I'd suggest the Accuride #28157, a 22.5" x 6.75".
http://www.accuridewheels.com/studpilot.pdfThe 22.5" wheel is the correct tubeless size to replace a tube type 20". The 20" x 8.25" tire outside diameter will be a near exact match for that of a 9R22.5. Please see the below chart to understand the differences between a 5° tube type wheel and a 15° tubeless construction. Stu McMillan
http://i286.photobucket.com/albums/ll89/truckdog62563/wheels/profilecomparison.jpgEdit: I just remembered that I have a friend on another site that has a set of the 6 lug x 8.75 pattern 22.5s for sale. If you are interested I can have him drop by here. I have no financial connection. Stu
