Read CMC Marine's Warranty Policy Here Transom Support Plates / Transom Washer Plates Made of strong 3/8" 6061 T6 alloy aluminum (not cast aluminum), the CMC transom washer can eliminate bolts “biting” into transoms and can more evenly distribute loads on high performance engines. Hole centers: Top Plate – 12 7/8" Bottom Plate – 9 7/8" OEM/Bulk Product Name Distributor Packaged A B C TSP-1 Top Bolt Holes- Standard TSP-1-DP 15" 2" 13" TSP-2 Lower Bolt Holes- Standard TSP-2-DP 12" 2" 10" TSP-1C Top Bolt Hole- Std- Custom 15" 2" 13" TSP-1CP Top Bolt Hole- Std - Custom & Painted 15" 2" 13" TSP-7 For Yamaha and Verado- 4 bolt holes 15-1/4" 3-3/4" 12-3/8" 20022 CMC, Top Transom Washer Plate / Transom Support Plate 14-7/8" 2" 12-7/8" 20032 CMC, BOTTOM Transom Washer Plate / Transom Support Plate