Does anyone know where to buy larger than stock throttle body plates? I may want to bore my TB more than 50mm, and I would need new plates. Should I just fab some? I did a search, and couldn't find any. I tried Holley parts lists, etc.

Has anyone done this? I'd just like to mod my own TB, something like the Fastman 52, or 53mm.

Any suggestions, advice, etc about how to go about this would be appreciated.