Yea, I had to replace the Glennis wheels on my Panther because I couldn't get tires for them anymore. Luckly I went with Intairco - which you can still get - as of now...

Come to think of it, jet wheels and brakes (and especially tires) are the hardest things to source. My son has Airtech wheels and brakes he got from CARF for his Hawk, and now they are gone and you can't get them anymore...

Bob