I've been trying to find something suitable, but so far no exact equivalent. I'm assuming you have the Talon spoked wheels, not the BST. The rubbers for the BST wheel are readily available, but not so for the Talons. The Talon rubbers are 31.6 mm OD, 20 mm ID, and 10.35 mm width. Those are my measurements on a used rubber, so they might not be exactly right for fresh ones, but close enough for looking for replacements. The closest I've found are universal rubbers from Gale Speed, at 32x16x11.
https://japan.webike.net/products/1513392.html
They would probably fit in the cush drive carrier, buy would require you to find bolts with a 16 mm head diameter to fit. Or it might be possible to remove the steel bush in them, which would probably give you the needed 20 mm ID. I've ordered a set to see if they will fit, and I'll post the results.
Another option for those so inclined, is to make your own. You can buy 1.25" polyurethane rubber tube in Shore 80A hardness, and machine the rubbers from them.
https://www.mcmaster.com/9697k145-9697K245
That's what I use to make them for my home made cush drives. I measured the stock rubbers at Shore 75A hardness, so the 80A is a good match. Or you can make some simple molds and just pour them from 80A molding urethane. Lots of info on pouring your own urethane parts (motor mounts, etc.) on youtube. I haven't tried it, but it looks pretty simple.
Ken