I recently bought the overpriced C-Dory factory cooler rack that doesn't fit my boat despite what the factory said....it's too short. After cleaning the goop off with solvent, I proceeded to devise a "make fit" solution. My question is...what's the best cooler for this rack...I've searched the topic but didn't come up with the answer. The inside dimensions are 3' long by 17 3/4" wide. Thanks!