The BL2563 was a model built between 1984 and 1990. This snowblower had several different mounting kits available, all of which are obselete now--either way, the frame under the B7500 first came out in 1994, which means that there was never a kit made for your tractor. The models to fit your tractor are the B2650 or B2660 with the B2652 mounting kit. Hope this helps....
Matt