ALL QA50 PISTONS AND RINGS ARE DISCONTINUED SO I WILL HAVE TO CHECK STOCK EACH TIME BEFORE I SELL A PISTON AND RINGS SET SO PLEASE EMAIL ME AT DRATV@YAHOO.COM piston #'s SIZE STD_(58B) .020"_59E .030"_258E(NO LONGER AVAILABLE FROM DRATV) .040"_58D rings #'s STANDARD_59M .25MM/.010"_316B .50mm/.020"_59G .75mm/.030"_304k 1.0mm/.040"_66H @ *QA50_PISTON (email_for_availability) .030"_258E(NO LONGER AVAILABLE FROM DRATV) @ *OEM_HONDA RING_SET FOR_QA50 STD. SIZE ONLY (59M) @ *OEM QA50 Z50 CT70 13MM PIN TYPE PISTON PIN CLIP 13115-200-000 94601-13000 7/20A (13A) @ *OEM QA50 PISTON PIN 13111-044-010 1/20M (R2166)