Here's a shot of the mount for the old starter. I used a piece of sheet metal to cover up the hole. One of the bolts is the original motor mount and the other is from the starter mount. Tin snips and five minutes later.......and viola. The sheet metal was flexed out a little so I used a bit of adhesive caulk to glue it to the transmission housing.
I used a clamp and ratchet to hold the sheet metal against the transmission housing.
Here's the finished product.