“The grooves look very similar to the stock pulley. What doesn't look similar is the overall length of the pulley. There is no extrusion at the back that sits up against the shaft so you have to use some sort of spacer or shim combination to stance it out far enough. The paint was chipping in the box on the way to me, it appears to not have adhered to the pulley. There is no keyway! You must broach a quarter inch keyway in it yourself if you intend on using it on a Troy-Bilt horse. If none of those are an issue for you, buy it and put a bigger motor on your horse!”