How all makes these? I know Billingsley Racing does, but how about any other companies?

Just price shopping, and not sure I want one with the Billingsley Racing logo on it.

 

I got one from Billingsley and it didn't have their name on it, but it did come with a sticker that had their name on it.

 

Make your own. This is something that is fairly easy to do and it will save you about 50 bucks.
Go buy a sheet of 18 guage aluminum. Now get a sheet of cardboard, one side of any decent size box will do. Cut out a square roughly big enough to cover your hole, now have a friend hold it from the outside while you get inside the car and trace the hole with a sharpie. Now cut out your template. take your cardboard template and lay it on your aluminum and trace around it but give yourself an extra 3/4 to an inch more than your template so you have room to screw it to the firewall. cut out your block off plate with tin snips or dremel cutting wheel and test fit, trim as needed and mount with RTV to seal it.

Yeah buying one already made is easier, but I like the satisfaction of knowing I can make my own stuff.

 

Thanks, good to know the name is not engraved in it like their pic shows. The picture of just the plate shows the name engraved in it, and the installed plate shows it without any engraving.

As for making my own. Well I don't have the proper tools to do it, and I like things done CLEAN. I know if I cut it up, it will be jagged and not fit perfectly. Now if I had access to a water jet or laser cutter, I'd do it myself.

I do enough custom things on my own...