I bought a Manners T4A for a M70 off their online inventory a few years ago; the only thing I wasn't sure about was that it was inletted for CDI DBM. I called them, and was told it required some mill work, and that they would do it (free IIRC). It didn't look like anything I couldn't handle on my mill, so I did it myself, and it works fine. If I can find the drawing for the cut that they sent along with the DBM, I'll scan & post it here - unless you guys have already seen it and it won't work for the chassis you're using.