Stephen,
Shaping the plastic pipe is the easy part. After the first time I acquired one of those "toaster ovens" (large size) and I now use that out in the garage (out of sight). Be sure to use a oven themometer and slowly bring the tempature up checking every 10 minutes or so. When you get it just right its like a thick sheet of modeling clay. I've molded it by using a upside down hull or by using rachet straps and "pulling" the plastic pipe up against the hull. I like the upside down hull method best. ( ...that's why you keep the extra set of hulls in the backyard, to use as molds!!!
Would you have been in trouble if they were Chevy parts???
2952miles --- Newtown Square Pa to Harrison Hot Springs, British Columbia.
Harry