This is what you will wind up making. I cut this on my bandsaw but it can be done with a hand saber saw Simply trace the inside of the bell housing and the outside for its shape. I use thin cardboard as a pattern to start with. The two alignment holes are the only one hyper critical. When you are drilling the holes the bolt holes are slightly oversized. But the alignment holes need to be exactly to size and location. I drill slightly under size and then ream to the final size. Continue