Here is a very helpful find for your Honda 500 XL, XR FT500 This is a new in the package ring set for the  1979 1980 1981 1982 1983 model years. These are the great single cylinder, four-stroke Honda 's. This is a standard size (STD) 89.00mm ring set.  Correct for part # 13011-429-005 and 13011-429-003 .This has the 2 compression rings and the lower 3pc oil control ring, everything to get your piston compression back where it should be.   Get your old bike up and running again. We only sell the best! This is a top-quality aftermarket item.   That is it!  We do also have on our website the very helpful complete engine Gasket Set, and clutch disc set too.  Thank you and we look forward to doing business with you