I've had 325mm hi specs under 16" raceline rl7's they were the only rims with enough clearance, tried a few others super leggars, speedlines etc but none fitted.
I've also seen a R with a set of 330mm ap's under 16" rl7's but apparently the wheels had some machining done to allow them to clear.
So if you can find a set of rl7's (good luck :lol: ) you'll be ok though the rl5's might also fit and there easier to find, the only other possible could be a 5 spoke wheel made by revolution that I can't remember the name of but its generally fitted to older cars.
http://www.revolutionwheels.com/rfx.shtml are theother wheels that could fit but there only listing them up to 15" but i've seen them in 16" so they must have done that size before and may still do?