GM - I have to admit that I have not used any patch pieces, but metal man knows his stuff. He is the resident expert on sheet metal. One more thing to add to both posts, Jeff at Bowtie bought a near perfect truck with a 3 window cab that had 25K miles and was always parked in a shed. 3/4 ton with a dump bed. He sent the cab to Taiwan to have patch pieces made that fit, using the cab as patterns. I haven't talked to Jeff lately, he moved to the other side of town. But I know that if you call and talk to him he will tell you how good or bad the parts are. When I saw the rear fenders he was selling I was amazed at how good they looked.