I'll have to get a better look at it. I know that the engine has an air cleaner up front between the two cylinders, a pressurized oil system, with a spin-on filter, and the starter looks the same as the starter that is on my B&S 15 OHV.
And it had a pretty large exhaust. but I was more concerned that the shaft would be the wrong diameter or not the right length.
IF I can adapt it without too much trouble, it will certainly be a NICE upgrade. This 15hp Airens has always seemed a little underpowered. It would never cut very fast, compared to my neighbors Simplicity with a 17 hp, Kohler. At least I think it is a Kohler, I know that it is a 17 hp, and cuts MUCH faster than my Airens.
So, I'll get a better look at it, model number etc., and post that info.