Is it possible to convert a 1996,25hp Johnson (J25RLED) manual start to electric start? Web site for parts?

You should be able too. If it were me, l would consult a local Dealer and let them order the parts for you so you will get the right ones the first time.

Richard C (below) has a good point.

I've run across this problem from time to time. If the parts r available from a dealer, which they may or not be, they will be expensive. Since this is a 12 year old engine, what I'd do is sell it & purchase a later model with starter, or a new motor. l think you'd be surprised at what the 96 motor is still worth, but u will be shocked at new prices. The bottom line is that when all the cost r evaluated u will be close to even. Parts or new engine will offset. P.S. l would not worry about what brand of motor.

ishopmarine.com