hey guys just picked up a 1990 indy 500 , or at leaast i think i did when i got the ownership off the guy i bought it from it says its a 1990 cls? no idea what that is? also the sled has no serial numbers stamped on the tunnel ...but it does has a frame stamp number on the right side 1751065 does any body have any idea what that number is and if it can tell me the year and model?