Rocker Switches for 93 Prostar

[sandman24]

Hi guys - just getting around to restoring a 93 Prostar I picked up. I'm looking for the rocker switches. I've searched the forums and can't find exactly what I need!

My boat has a combination of the ON OFF ON and ON OFF.

many people seem to be recommending these for the ON OFF -
http://www.jmsonline.net/illuminated...ie-rk40370.htm

How can I figure out which each switch needs to be for amps?

I stopped at Grainger and the only 12v 20 amp ON OFF ON with lights was $60!!

On top of that... some of wiring is already disconnected from the switches in the back. Is there a diagram that I can find showing which color wire goes to which terminal?