I have a pair of Vision clip ons for 31.8 bars. They are the alloy version and are 230mm long, but I chopped the ends off so they don't stick up so far, but still have enough upsweep to rest your thumbs on. I only used them for TT's on my road bike, so they have been used probably 4 or so times. They are in 100% perfect condition and are pretty much brand new. I have all the exra risers and hardware and stuff.

$60 will put them at your door (assuming your door is in the contiental U.S.)

P.M. and give me your email for pics.