I came across a mod someone did on their SDCC Shockwave. SDCC 2012 Soundwave/Retaliation HISS conversion for POC elevated treads (tutorial) - The Fighting 1:18th He used a POC Cobra Hiss. I liked it because of the rubber treads. Much better than the Retaliation HISS faux tank treads. I thought i could do it without cutting up my Shockwave. When I bought a Crimson HISS, I compared the treads to Shockwave's. The mounting posts were very similar. But not enough for a simple drop in upgrade. Luckily I also have the Retaliation HISS so I used the lower assembly. The socket for the tread post has a shallow cylinder. These got in the way of the POC/Crimson HISS treads. So I cut them off and widened the hole just a bit. Now my Shockwave has rubber treads and I can swap the original tread assembly if I want. I just sacrificed two HISS to make Shockwave that much more awesome.