Part number 21001. This ignition tune up kit is for OMC Stringer & Cobra, Mercruiser, & Chris Craft stern drive motors. Includes contact set, condenser, & rotor. This is a new Aqua Power part. It replaces OEM OMC 172527; Mercury Marine 34235A1, 34235T1. Application for OMC, Mercruiser, Chris Craft. For 4 & 6 Cyl Delco Distributors.