There are several makers of these panels...Blue Sea, BEP, Paneltronics etc...Blue Sea is good, but West Marine is probably the most expensive....try online somewhere as you look for the same model since you like it.
Most panels have main power wiring coming into the panel to power the whole thing, and then you will have the individual wires from each accessory that will be attached to the appropriate toggles....I would cut and make new end connections for all your wires to be sure they are solid....use shrink tubing over the connector and put a light coat of electical connector grease (sold in small tubes in most marine stores) on the final connection to keep salty moisture out.....all units should come with an installation guide and use your owners manual to trace or color code your wires.....you may need to modify your existing hole to make a new panel fit.....lets see your handy work!