I didn't even think about eBay!
After more research and a few phone calls, I've learned a little. It appears that the carb is a Keihin PWK 35mm, and that a lot of KDX models use this same carb. So I'm assuming (and being told), that I should be shopping for the PWK-35, since there are no differences no matter what it's going on. Also, the PWK-35 AS (Air Striker) is a bolt on replacement updgrade, no modifications needed and is used on the newer model bikes instead of the PWK-35.
Does all this sound correct???
TIA,
Steven