No one that I know of has tried ZMF pads on the MSR7. Considering that most, if not all ZMF pads are actually bigger than the HM5, I don't think they'll work. If you insist on going ZMF, go with the ovals, but I wouldn't spend that much money for something that will potentially not work at all. And I don't just mean sound, sound will get altered a lot. I mean they may not fit physically. With the HM5 we already need to use something as a spacer inside the pad (best is to use foam backer rod) for it to not get squeezed off the sides of the frame, so an even bigger pad would probably exacerbate the problem. While I haven't tried them personally, the only pad that would MAYBE work with the stock MSR7 is Dekoni's M50x pads. That and some people have reported that Yaxi pads work, but I've never used their stuff. Your other option is to get a pair of HM5 pads and mod the headphones a bit, as I've discussed a lot of times in this thread. This, IMO, provides the best results as it retains enough of what makes the MSR7 great, while making them more comfortable to wear, less fatiguing to listen to and actually provides enough bass for everything, unlike the stock headphones. The choice is yours.