I have a 26 which I installed diamond plate in. I don't know what the factory installation was on your or my boat, if there ever was any. However back to the question at hand. My boat has 4 stringers. I ran the diamond plate on each side of the motor from the hull side to the first stringer on each side. I bent the over all length on each plate so as to be able to screw it to the side of the stringer. I think it looks great. It also gives me a flat surface so as to work on each side of the motor more easily. I also installed diamond plate on the front bulkhead (firewall). Hope this is of some help.
Dave M. aka Hustler 26