Ok...I need a mechanical seal for my 1980 cx 500. I look on ebay and there are 3 for around $20. They however are listed as for a 1982-1983 cx 500 650 and 650T. These must be different. I then go to honda parts barn and search for my seal, and the one that comes up is listed for all....1978 -1983 cx500.....are they the same? The part numbers are different, but would it work?