I bought this set of crankcases of Ebay, they were described as 54M but they are actually off a 360. The part # 6660.00101w & 6660.00201w. They have no damage, there is no engine # but some body has stamped 54M 4528 into them (very rough) hence the confusion.All I want is my money back or swap for 250 crankcase's to suit my 54M enduro $30