On Line Metals is where I got the amp plate. 1/8" 6065 aluminum. Prices are good but the shipping always seems kinda high. Also, don't expect shiny smooth. Both this aluminum and a brass plate I used for the Cornet had scratches, some deep. I also found out that standard powder coating from my local source was very smooth and not that durable. Textured is better and that's what I'll get next time.