Heatsink question

[caraudioguy2100]

I have a car amp sitting here minus the heatsink .

Does anyone know where I can get a bare heatsink to mount the board ?

The board is roughly 24”x8”

I’m looking for bare heatsink so i can mount the board and transistors flat and do my own design but still have it look like a car amp .

 

[JonSnell Electronic]

I use, guillotined to the required size, plate aluminium, similar to heavy vehicle non slip kick plates.
They have a pattern one side similar to a man hole cover but smooth on the underside and work very well.