Tool Pinion Gear Shimming for Mercruiser 1 R MR Alpha Mercury V6 91-56048001 - GLM90160 Pinion Gear Shimming Tool to measure pinion height of Mercruiser 1, R, MR Alpha One and Alpha 1 Generation 2 Drive Sterndrive Units and Mercury / Mariner V6 Outboard Gearcases. Replaces Mercury Marine Quicksilver original equipment part # 91-56048001; Sierra part # 18-9853 About Us Basic Power and its staff want you to feel 100% confident in your purchases. Here are a few reasons why: Multi-Million dollar inventory In Stock and Ready to Ship from our huge inventory Shipped Same Day when order is placed before 2pm Highly Technical staff available Tracking numbers are visible through purchase history right from your computer We sell ONLY quality marine specific parts Contact us through messaging system PayPal payments and Credit Cards through Payment System are accepted Ships best way via USPS or UPS Shipping Shipping rates of $12 and less are eligible for combined shipping. Items with $13 or more shipping cannot have the shipping costs combined. Our normal handling time is 1-2 days. Payment We accept payment by any of the following methods: Payment System(Visa,MasterCard,PayPal,Stripe and many others)! Please pay as soon as possible after winning an sale, as that will allow us to post your item to you sooner! Returns No Returns Accepted on this item.