This is replacement faceplate for many Yamaha's with the OE Polk PA450. The main dimensions are 3.5" x 5.5" with a 2" cutout in the center.
This is to remove the Polk PA450 Commander that is in the transom, and replace it with a metal plate that can cover that large hole, with thru holes to mount it.
The 2" hole is for a replacement remote PRC100BC, but other circular models will fit as well.
The plate is 1/8" 304 Stainless with gloss black powder coat. 6-32 black stainless fasteners are included.