N90S camera plate. The Kirk base plate worked well with the RRS lever clamp. I no longer have that camera.
F5 camera L-bracket. This bracket had square corners instead of the rounded corners as on the RRS L-brackets. I sold the Kirk and bought a RRS for that reason. Otherwise the Kirk bracket worked well with the RRS lever clamp.
On occasion my shooting partner and I exchange lenses. I sometimes shoot with his 80-200mm f2.8 AFS which has a Kirk plate. That plate works with my RRS lever clamp.
I don't recall any of the above Kirk model #'s.
The lever clamps seem to have limited side plate travel, hence the need for the same design fits. QR clamps with the screw knobs seem to have more travel are able to over come some design differences from various manufacturers.