I thought it was common knowledge, It's been discussed several times on several forums and I just thought everybody knew. I got a set when they first came out, fried an mfu on a KT, and haven't used them for anything except PIIIs and PIVs ever since. But in a Panzer III they work great. And in that video he never says what gearboxes he put in the sturm and he doesn't show a photo of them.