These Muffler Screws may be used with the following OS engines: / Old .20-FP FP-S, FP-M series / Old .25-FP FP-S, FP-M series / .25-FX / .32-FX / .40-LA / .46-LA / / PACKAGE INCLUDES: 2-Screws (phillips head) / / SPECS: Threaded Length: 27mm / Outside Diameter: 3mm / / 6-7-94sk / updt jxs 12/27/04