At looking at CPP's website, it looks like I need their Firewall Mounting Plate.
http://www.classicperform.com/Instructions/PDF/6072FP.pdf For $320 for the booster, you would think they would throw in the mounting plate... or at least recommend you buy one when you place the order for the booster. "Oh yeah, you might want to buy the adaptor plate if you intend on installing this thing".
Lee