Here is a very helpful find for your XL350:  This is a new in the package ring set for the  1974 1975 1976 1977 1978 XL350's. These are the great single cylinder, four-stroke Honda enduros. This is a standard size (STD) 79mm ring set.  Correct for part # 13011-356-003 .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! Good Luck!  We do also have in our ebay store the very helpful complete engine Gasket Set, engine Oil Seal Kit, Carb rebuild kit set and new clutch Friction Disc Set. So if you may need these too, please search in our ebay store and we will always work to combine shipping for you too. Thank you and we look forward to doing business with you.