Rockford Fosgate amp question

In the newer T series amps there are what I believe to be mesha boards behind all of the power supply fets and outputs they are white in color .

Does anyone know what these are made out of ?

I have 5 amps sitting here with them missing and would like to repair the amps but wondering what I can use to make new ones ?

Any info would be appreciated
If seankane doesn't have them, you can probably use something else. They appear to be aluminum with a thermally conductive ceramic coating. They're likely used to act as a smooth surfaced heat spreader to more efficiently get the heat to transfer to the rough heatsink. Using a mica or other insulator between a smooth piece of aluminum stock and the transistors may work well enough.