Here's a pic of mine with Cat SX arms, yes they go straight on and you can use Losi pins. I have used SX Yokes as they are the same as the cut down Losi ones. Just waiting for a Kyosho Ball end set to beef up and metric up the front some more, E-speed towers on way to.
You can also use an RB6 front brace across the front of the XX4 something i will do when i have time, it needs a little fettling.
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