lightening up my '00 WR400. anyone no if i should use an aftermarket (maier,polisport) # plate for a yz400 or yz426? different part #'s for both. do i need something off these bikes to mount to? wr headlight/# plate uses brackets, yz 400 and 426 probably doesn't (do i need brackets from one of these bikes?). any answers, suggestions? thanks. also, are the aluminum subframes that much lighter than the steelie on my wr? worth it? reservoir will be gone. thanks.