Deck Plate size on 2000 Supra Launch DD

Hey guys my deck plate cracked and fell apart. I need to know what size the deck plate is my dealer ( who is three hours away) said they can range from 3, 6, and 8 inches. My boat is located a little ways away and I cant make it out there today, and was wanting to order the plate today. Just wanted to see if any one knew what size the plate would be for 2000 Launch DD. The plate is located right in front of the engine compartment. Any suggestion would be appreciated.

Thanks,

I measured and mine is---7 inches overall, on the top of the carpet, pretty side.
When you take the lid off the access hole is 5 inches (inside)
And 6 screw holes.
Make by Beckson.
I found replacements on e bay, when mine cracked.
I couldn't find anything better or stronger than replacing the original.
Hope this helps.

I checked and my receipt says the deck plate that I purchased on e bay is a 6 inch.
no model number found.