I was doing some repair work on a friends '99 Mach 1 and discovered a crack in the rail just above the front idler wheel. I dissmantled the skid and found that this particular year / model employs a reinforcement behind the rail so the crack is nothing to get too worried about. Check here (http://216.37.204.206/ingles/Skidoo_oem/Skidoo.asp?Type=13&A=321&B=16) item number #60 part number 503189060 PLATE-REINF. $9.97