Redoing the entire bathroom. My wet wall is made of 2x3s and the rest of the room is 2x4. So I need a shower valve/diverter kit that will fit in a 2x3 wall. Water is coming up directly below so no need to cut holes in the studs and venting is below as well. So 2x3s work except for necessary depth requirements for a shower valve. I've read that there are products by Moen and Delta that will fit but can't find them.