I teplaced my original Simpson Lawrence with a Lewmar 1000 Sport Fish with free-fall. After comparing them side by side and seeing that the Lewmar was identical except for the polished SS case I just dropped her down in the same holes.
One thing though, the Lewmar solenoid is a lightweight POS compared to the SL unit. If your solenoid is still good, keep it. About the easiest, most trouble-free swap I ever did on any boat. I’ve got the photos around here somewhere, let me know if you need them. I think the 700 series Lewmar unit is probably the same mounting pattern as the 1000.