Yeah, I also am gonna need mineral wool pads for my SR-Lambda too, so hoping there is a good source. They did ship to me today though, so I should have them in hand by the end of the week. Really enjoying my SR-404 in the meantime, much more than I like my Lambda Pro. The Pros definitely dont have the foam behind the pads, and I dont think the Lambdas do either, though those pads are pretty new, so who knows.