[mahanian]

The opening through the radio plate is 7 1/8" x 2 1/16", The corners are opened up with a radius to allow the overlap of the sheetmetal of the cage to fit through.

The opening for the radio trim ring is 2 5/16" x 7 9/16". Of the dozens I measured, the largest radio trim ring was 7 1/2" and the smallest was 7 3/8". So you would have either a 1/32" gap on each side minimum or 3/32" gap on each side maximum (as shown in the picture above)

The remainder of the first batch is on it's way out, the second batch should be complete next week

I only have a handful of radio plates left for sale in the second batch, which is at the polisher now. The price is $95 shipped each which includes a fully polished trim ring, all mounting hardware, installation instructions with a drilling template, a polishing wipe.