I use the AF confirm one for Leica/EOS adapter from this guy
AF-Confirm Adapter Pentax PK lens to Canon EOS camera - (eBay item 170156717881 end time Oct-14-07 01:42:06 PDT)
So far it's pretty good I would use the confirm focus since the stopdown metering with Av seems to be more correct than the non-confirm focus one.