LOSA 3124 should have all the parts you need. It's the springs, spring cups, and spacers for the Hydra Drive unit, and it's what I used when I ran Losi slipper parts.
As a small note, the new B4.1 has completely new slipper parts: pads, plates, spring, and even plastic spacer pieces for the spring like Losi uses. BK's working to get the new parts and test them out, see what we think of them.
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