Arca-type L-plates to fit Canon Booster E1?

[David R Munson]

I have a Canon EOS 3 to which I have fitted the Power Drive Booster E1. I'd like to get a dedicated L-plate to fit an arca-type QR clamp, but am having trouble finding info about whether such a thing even exists. As best I can tell, no current plates to this specification exist, but what I can't find info is whether plates made for something like the 1Ds Mk II might fit or if there are discontinued plates that would fit.

Anyone have any ideas?