Well I just bite the bullet after 3 years of borrowing sleds. I purchased a 2000 700 skid doo summit and a 1997 670 summit. The 670 needed lots of front suspension repairs and all parts are on order. My friend is calling the 670 franken sled from all the mods. It has a 156" track and aftermarket tunnel. I believe the original serial numbers where on the OEM tunnel. Is there another place I can Look.