Yamaha - Performance Series Propeller - 3 Blade - LH- 14-1/4" x 22 - MAR-GYT3B-L6-22. Genuine original equipment manufacturer Yamaha Parts offer several advantages over their aftermarket counterparts. Firstly, OEM parts are precision manufactured by Yamaha to exact fitment standards. An OEM part will fit the engine or component it was designed for perfectly. How many times have you bought aftermarket parts only to find they don't quite fit and need a bit of modification (filing a piece here, bending a piece there) to get them in place? With OEM Yamaha parts you're guaranteed genuine fitment every time.. The next advantage of OEM Yamaha marine parts is the build quality. Yamaha's factories Utilize state-of-the-art manufacturing techniques and technology. Yamaha uses only the finest materials to manufacture its OEM parts and accessories. The companies producing aftermarket parts haven't got the same levels of manufacturing sophistication and don't always use the highest quality materials