Hi all, I'm replacing my Sterling SUB 4's pickup with a Nordstrand MM4.2 but when I took out the old pickup I was surprised to see a couple of bars stuck on the back with foam & springs stuck to it so it's much deeper than the Nordstrand. So, what's the best way to mount the Nordstrand? Reuse the foam & springs on the back of the new pickup & pack it out with a piece of wood? Any experience anyone has with this would be great. Pics attached so you can see what I mean. Thanks.