Have you looked at all the ads on boattrader and yachtworld? Someimes you can get clues from the owners' pictures. I went through this with my Carver 3 years ago with no luck. In the end I had to design my own installation from scratch. If you haven't already, do a LOT of reading. Positioning of the seacock, strainer and pump are critical. All 3 have to be below the waterline as the pumps won't self prime. You also need an "upward" flow from seacock to strainer to pump.
I did all that, plus installing a new, complete 30-amp circuit to power the A/C. Took me a month to design it and another month to install it, but it works perfectly. Impresses the hell out of your friends, too
Feel free to PM me if I can offer any advice.
My .02