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This thread might be useful.

https://www.rc10talk.com/viewtopic.php?f=31&t=41330

Bandit rear arms are the same. You can also use Bandit/Rustler front arms, you'll need to use some spacers on the suspension shafts. Or some have actually taken a bandit front bulkhead and split it down the middle, took a potion of it out to make homemade TRX1 bulkheads with the bandit arm mount siz...

Great work, that is a small width difference and not a big deal. Best part is now you can just use Bandit parts which are cheap and easy, realistically will drive the same as original.