Are you a dealer? I saw in a post about Throttle Control their are new part numbers. 450120 and 50825, I called my dealer and they said the 450119 is about $900. I am looking online for the part. Do you have this part and is the 508258 the Model number?
I just saw a picture of the floor of your boat (showing part of the walk through seat option) and noticed the hole plug and square carpet even with the observers seat. My '07 Maristar doesn't have either and I know there was a table option offered at some point. Is the hole plug for the table?