Look on eBay. There are LOTS of vintage parts listed there all the time.
Might even be able to pick up a parts sled for cheap. I just let a 1980 Jag go by... went for $152, and it was within an hours drive from home. Should have grabbed it, but didn't think I'd have the time to swap parts. Wish I had gone for it now. The seat alone would have been worth that. The seat on my Jag was shot, and I had to put an after market cover on it. Looks crappy!

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2000 ZL 550 (Solar Flare, #045/1000)
2000 440 Panther
1980 Jag 3000 F/C
"If it ain't broke, take it apart and find out why!"
Member:
Canaltown Snowmobilers Inc.