anyone know which one it supposed to come with...just found out mine does not have it thanks joe

I have a 84 trans am with w62 ground fx's and mine takes a one piece...I think the three piece if for cars with out ground fx's...it should be easy to tell though just look under the car and the bolt pattern for the one piece will be a big U shape and will blolt to your front end and both fenders as well. If you dont have bolt holes in your fenders it is probably a three piece.