Re: What is this type of bracket called?
The Sea-Drive was a short lived idea by OMC to answer the demands for a full transom boat...and still use outboard power. This was during a time when the Outboard Brackets were pretty new to the market. The Sea-Drive was just a normal (V-4 & Later V-6) outboard motor mounted on its own bracket. I had one mounted on the back of a 19' SportCraft CC boat. I think it was labeled something like a 1.4Ltr which turned out to be a normal bubble back V-4 JohnnyRude. It ran like a normal V-4 OMC motor, except it was HEAVY and made the boat sluggish.
When you needed to repower....forget it. The entire unit HAD to be replaced. When OMC took a dump, repair parts became very very hard to find. Motor parts were identical to their OMC cousins, but the Sea-Drive parts became a beast to find. Down here in Florida, I still see a few of these hanging around...mostly for parts...and it is almost always a SportCraft.