Re: need power head omc sea drive
The SD model number will tell you if it's a long or x-long.
Personally, if it were mine and I was going to a bracket I'd go with a 25" motor (X-long) to keep the powerhead up out of the water as much as possible and have the extra room for tilting (clearance for the hood on the outboard).
If the SD is a 25", I'd sure go with a 25" outboard.