Batboard

I have a "new to me" ex-police vehicle ML910, that I acquired without any power adapter. I'd like to save money by modifying a less expensive adapter to fit the ML910. I assume that any 19V adapter will do an adequate job, and that the trick is to change the plug to fit the ML910. Has anybody else done this; any problems, or successes? Does anybody know of a source for the four-pin adapter, and the way the pins need to be connected? Will appreciate any thoughts/guidance/horror stories.

I have some nib ml910 power adapters , pm me if interested