The New Suzuki Quadracer HQ Welcomes All LT500 Quadzilla, LT250, LTR450, LTZ400, LTZ250, LT80 owners to the Suzuki Quadracer HQ forums
Only other one I know of was Chris G, and I think he sold that long time ago.SLC would be the place to get one.
You may give stellar a call and see if they'd be interested in building one.
Here are a couple pics I that arched swinger for the zilla that uses a banshee carrier.
RAD manufacturing makes tapered and dual row carriers for 250/500 also. http://www.radmfg.com/RAD-Bearing-Carrier-S8-fits-LT500R-p/rad-bc-s8.htm Jason @ Honda east used to have them in stock for real cheap.
http://www.suzukiquadracerhq.com/index.php?action=store