This is what you will need to make. The holes for the bolts aren’t hyper critical. Drill them slightly oversize They only clamp. The ones holding the plate to the block are Allen head, Flathead, countersunk. the 2 alignment holes are the critical part. You can use brad point bit drill bits to exactly transfer the location. If you don’t have a set of transfer punches. Then drill slightly undersized and ream to final size for accuracy.