I have an older Sears 15 gas furnace with air conditioning. The only info I can find on the air handler is the sears fifteen, no other model or serial. My blower wheel is falling apart. I have the dimensions of the original wheel (10 1/4" dia, 8" width with a 1/2" bore. Local shops want more info (mod. And ser.#) to order one. Any sugestions? Thanks