Designed for GM engines with 14 inch flywheels. This Marine Starter by Arco has a standard staggered bolt pattern for bottom mounting. Arco GM Gear Reduction Marine Starter | 30433 New inboard and inboard/outboard 12 volt starter Two long bolt staggered bolt pattern Fits GM engines with 14 in. flywheel Direct OEM replacement Delco Remy starter Must be used on late model 3.0 liter GM engines with tail support bracket Mounting bolt kit MBK450 is needed when replacing full size 10MT starter Replaces Mercury/Mercruiser 50-863007A1 | Replaces Volvo Penta 3885317, 3860764 Replaces BRP/OMC 3860566 | Replaces Marine Power 475447 Additional Information Established in 1960, ARCO has 60 years of manufacturing experience with a focus on building the most reliable products. The company takes pride manufacturing products in America to the highest standards of quality control and testing. Proven dependability makes ARCO the trusted source for OEM quality or better alternators, marine engine starters, and tilt/trim motors. Nearly 60 years ago, ARCO set the gold standard for marine engine parts. ARCO began with a superior commitment to dependable starting and charging products. They then developed the best technical support available in the industry. ARCO ensures the highest quality by following five key principles. Proudly Based in the USA In fact, ARCO product manufacturing, quality testing, warehousing, and fulfillment take place right here in the U.S.A. OEMs Rely on ARCO Products ARCO's products are manufactured and precision tested on-site, before they ever leave the facility. This ensures that every product that carries the ARCO label will perform at or above OEM specifications. Products are 5x More Reliable ARCO is proud that their marine engine products are engineered and manufactured with precision quality, making them the most dependable in the industry. Industry's Best Warranty The most dependable marine engine parts are now backed by the industry's best warranty!