I have a slightly used dual bearing ballancer off a 03 i was told., the size shape, and gear look identical. The only visible defference is the dual bearings, maybe just needs different size shim. Any other way to tell, since there are no numbers on it. My local dealer wants to charge $420.00 for the new upgraded balancer. I would hate to order it, and then find out the one i have will work. Any suggestions?