I have a 1996 31 Open. Had same issue, by the time you remove the old instruments, there are many holes o fill. I found a company who made the 3/8" black plate to my specifications and routed the edges. Added a Garmin 7612xsv, HD thru hull transducers, Garmin Fantom 24 dome, and updated the old Raymarine autopilot. Gives me a wide open canvas to work with.