Here'* what I came up with:
The gray areas are fiberglass that I had to add to the original trim piece. I dismantled the Olds trim and drilled and countersunk for three 8 x 32 screws that are epoxied in to produce studs. Outer trim goes over the shifter first then the inner piece is installed on top and nuts are screwed on from the bottom. I have to wait until tomorrow to see if the epoxy will do the trick.
The other problem is that the inner trim is flat but the outer trim is curved. Since the inner trim is on top, I'll have to add more fiberglass and blend the two shapes.