My buddy has a set of aluminum heads for sale but im not sure of the make. they are twisted wedge but dont say trick flow any where on them, on the exhust side one head says sn15505 and the other say sn15519? and on the front of the heads it say 205 A 6, they are pedestal mount and they are also o-ringed. did trick flow make an earlier model and not put there name on them? is there any other company that makes a twisted wedge heads? Thanks for all your help