Haven't actually tried looking anywhere else yet but thought I'd throw it out there, I'm after the ones that have studs attatched to the spacer. 15mm or more would be good, only need 2 :D
the smallest ones ive seen that have the studs were about 19mm. the ones with the studs bolt on to your factory studs so they have to be as thick as the lugnuts. i had to grind the factory studs down a little on my car.