It uses some channel stock that allows you to adjust each radio into position up and down for a perfectly adjusted fit.
This was my only option since my panel layout did not allow enough room for 3/4" angle to be used and still keep the spacing where I wanted it.
Many thanks to Machine Man for making up a batch of the nuts that slide into the channel.
Here's where I purchased the red anodized channel: http://www.eagleamerica.com/product.asp ... 1203637173