J&P Cycles has them in their cat. Got mine at a bike show in washington dc last year. keeps the neck toasty, but fogs the face shield more. I paid about $12.00. If you look for closeout sales at the shows you can get a good deal on just about anything.

Chip Sciarra "07" America, N.C.Switch Blade windshield, Moto Lights, Tri. Off Road pipes