I just installed one in my 72 last week and it's a snap to do. Harderst part was actually putting that hole saw on the skin to cut it!! No more cord out of the bumper box for me. Also, the website you listed has a better price than I got from West Marine. In different places you may see 2 part numbers for this thing, one of them ends with the letter "B" and the other is -"BRV". I contacted Marinco before ordering to find out what the difference is, if any. They told me that the only difference is the packaging. It comes with an outside rubber seal but does not come with mounting hardware, uses 4 #8 screws.