I have an 86'. The lower chain guide that the chain rolls across on its way to the axle is heavily worn. I looked on ebay for a replacement. eBay shows the 87' and up models have a lower chain roller, and not a guide like my bike is equipped with. The question I have is mine suppose to be a roller, or a guide like mine has on it. If its a guide, then does anybody have info on where I can buy one? eBay doesn't have either for sale.