not sure bout the R33s, but on the R34s, to replace the parkers u'd need a really small hand like mine to get in there, otherwise u would probably need to move the washer bottle out of the way and also the factory airbox on the other side. Its real easy once u can get to it, just twist and turn and it pops out. I got my white LEDs from autobarn for $10 and they work just fine.