I finally replaced the auger shaft bearing on my 824 Powershift and need to put on new belts. According to my manual, it calls for a 632951 and 632961 which is supposed to be 1/2 x 33 and 1/2 x 39. I went to the local Tractor Supply and found according to their belt measuring tool that a 1/2 x 32 and 1/2 x 38 matches up a little better to the originals. The originals have no numbers or anything on them, I have no idea if they are original to the snowblower or if they were changed along the way. Has anyone run into this before or can anyone chime in with a belt size that works?