Anyone know where to purchase swingarm extensions from?

You can get them from Schnitz Racing.

A forum member made some for his own bike. He was supposed to offer some up for sale, I don't know what ever happened to that?

All you have to do is look....

http://www.r1-forum.com/forums/showthread.php?s=&threadid=67066

These are new and in stock... Speedlinks setup.

http://www.tobefast.com/detail.aspx?ID=560

I just came across some on ebay too

buy mine!! check ur pm.

i have a new set used once. i will sell for 250.00 plus shipping.
Dennis