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Keeps chain running smoothly 2-5/8″ arm Larger 1-3/4″ roller Improved & updated Drive chain tensioner with roller for the Baja Mini Bike MB165 & MB200 (Baja Heat, Mini Baja, Baja Warrior) Note: The arm on this chain tensioner is 2-5/8 inches long Drive chain tensioner with roller for the Baja Mini Bike MB165 & MB200 (Baja Heat, Mini Baja, Baja Warrior). Note: The arm on this chain tensioner is 2-5/8 inches long. Older versions were 2-7/8 inches long. The 2-7/8 inch chain tensioner can be found at the link below: Chain Tensioner with Small Plastic Roller & 2-7/8″ Arm for the Baja Mini Bike (Baja Heat, Mini Baja, Baja Warrior),5 What is the replacement part for the discontinued 2-7/8 chain tensioner with the smaller roller for the MB 165. Does the 2-5/8 with the larger roller work Would appreciate any input. Thanks It’s possible that you may be able to directly swap the discontinued 2-7/8″ chain tensioner for the newer 2-5/8″ one, though