I bought both drive belts for my MTD Legacy lawn tractor (1987 Central Park model 631) and the belts that Jacks supplied were from MTD itself. This insured
a perfect fit and the width of the belt, which is very important, allows the belt to run at the right height inside the pulleys. I used belts from NAPA and Autozone to get me over the "hump" so I could continue mowing, but in no time those belts were worn down to nothing, because of slippage in the pulleys. I now have my seven speed transmission back, which is reliant on the ratios that the pulleys and belts create. An extra treat is that these belts are priced very competitively and easily 50% cheaper than if I went to MTD directly. Nothing beats Jacks
for replacement parts and the service is always excellent!