Not so sure about the 2000s, but on the TRs, the Zenith Strombergs always came out on the "emissions spec" cars, for the yank market. The SUs were always fitted to the "full fat" sports cars. The TRs that I've seen that don't run injection often run SUs unless they've gone the full weber route. Nothing terribly against the Zenith Strombergs, just the SUs were always consensually preferable.
Get a couple of HS-6's on there, they're pretty common