Fabrication of 62 Shasta Wheel Well trim???

I would suggest taking a photo of the area to be trimmed and go to a place that makes aluminum windows or an aluminum shop and ask them how much they would charge. You might even take a piece of cardboard and trace the outline of the opening to be trimmed. You might find that the shop can help you out for a fairly nominal fee. They should have the bending machines and skills to knock two pieces out very quickly. Take a sample of the old trim or the trim you want to match. If that is not an option, and you have the stock trim to work with you might try softly heating and forming the required bends...sloowwlly.