Thanks again Kevinski. It appears the overall length is 8 3/8 inch and I can't tell on the width of the piece. I'll need that measurement...either in inches or in mm. Plus I will need the thickness of the piece (at the thickest part and at the thinnest). And I will need the distance between the holes...center to center, preferably. And I need to know if the retaining bolts Chevy used were fixed in place or if they slid back/forth. What I suggest is making a plate to match this one in size with the attaching "bolts" cast in place so there is no sideways adjustment to it. Radio centered in it. The bolts will be less in diameter so there will be some give there but not a lot.

I see that taper. For a poured in place fiberglass resin or epoxy piece which is flat on the front that isn't always easy. The silicone mold I'll make will provide the best side on the bottom of the pour and the top will be self-leveling, so the taper is kind of tricky. While the top will be self-leveling it won't be smooth enough for painting and finishing. It doesn't look like much taper is there. Do you think we could get by with a piece that was flat on both sides?

~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end