That's them, but $0.50 says they won't have them if you call.
I made mine based on the pattern so gratiously provided above. I was able to go bigger in nearly every direction due to the mounting hardware I used. I put holes in mine for turnsignal clearance, but wouldn't do that again. Not really needed and I really stink at free-hand cutting a circle.
All in, I spent about $50 for mine, $12 of which was for a package of 5/8" stainless fender washers, my local fastenall wouldn't sell me just 4...