Found em. I hadn't thought to look on the traxxas site:

ZERO-DEGREE (0 ) SUSPENSION ARM MOUNTS: Removes the rear toe-in built into the stock suspension. Use on high-traction surfaces only. These mounts will reduce stability on slippery surfaces. You can increase your truck's top speed for racing on high-bite tracks or drag racing by installing these 0 degree rear suspension arm mounts.

Part #2797 0 Degree Rear Arm Mounts (2)
Suggested retail price $2.00

Part #2798 1 degree Arm Mounts (+/- 1?) (stock rear mounts) (2)
Suggested retail price $2.00

i found them on tower, listed as mounts for a trx-1, butr according to the traxxas site, they are for the rusty, and from the pics, they look just like the rusty mounts