Originally Posted by Kraig
Horizon has some arms in stock at their central warehouse. I don't know to much about other options like hubs and caster bocks. I thought the original JRXS parts (hubs and caster blocks) fit. Maybe I was wrong.
Hubs and casters are a carry over, just that the new stuff is EA3 instead of graphite. You can use your old hubs and carriers with no issue.