I need a quick release plate for the R1

I am finally giving in and upgrading my tripod and ballhead.

I have decided on he Acratech Ultimate ballhead.

http://acratech.net/index.html

Unfortunately they offer no quick release plate specifically made for the R1 (They say I am the first one to ask for one). The Ultimate Acratech uses a "Arca-Swiss” type quick release clamp so any company's plate should work.

I know that I could use a universal plate, but then I would probably lose the stability provided by a built in retaining lip.
No luck with Google, so any help will be appreciated.

John