Hi Mark,
I may have given some misleading info in my previous post when I mentioned SD130 saildrives; subsequent online searching has revealed that the MD2020 engine is normally coupled with the SD120S. I have attached a link below that contains some images of this model which might be sufficient to ascertain whether or not you have the same model:
https://www.shipoutletstore.com/en/saildrive-120s-c-with-ratio-2241-volvo-penta-85395.html
If your boat is out of the water you will be able to see whether it is a one-piece or a two-piece item.