A while ago there was somebody on here who did CNC work, I cannot for the life of me remember who though!
Basically, I need something made like the picture below (just the spacer plate, not the bung, bolts or gasket). I don't need the seal around it, literally just the big hole in the middle, and the 4 holes. Not fussed what material it is made from, although alloy would be nice. I believe the thickness is about 15-20mm.
I can get the measurements, and make a drawing, although its pretty simple!