Need help in buying a bigger alternator

Hey all-

I need to upgrade my alternator for my upcoming stereo system. I emailed Ron at dbelectrical.com (he came highly recommended by folks on this forum) and he emailed me links to the following 3 alternators.

http://www.db-starter-alternator.com/Items/400-20004%20marine%20alternator?

http://www.db-starter-alternator.com/Items/400-20003%20marine%20alternator?

http://www.db-starter-alternator.com/Items/10si-marine%20new%20-140%20amp?


He says these units are delco replacement for mando/prestolite and leece neville alternators. They all will do approximately 150 amps@ cruise and 65-75 amps@ 500 rpm. He told me to look at my alternator and let him know which of these looked like mine. Problem is, I am out of the country right now but I would like to get the alternator ordered now so that I can install it as soon as I return home. Obviously I can't walk out to my boat and take a look at it right now. I have a 2004 Malibu Wakesetter 23LSV with the 340 Monsoon; does anyone know which of these alternators will fit?

Thanks-
Sam