After much searching for a cooler sturdy enough to stand up to my weight or that of my sons, and did not cost the $250-$300 for one of the big names.
I found a 30 qt rotomolded cooler with nearly perfect dimensions by a company called Blue Cooler. The original seat cushion fits it well. Even better, it cost less than $140.
I have the big name 110 cooler on my other boat, and this one feels just as strong. It installed easily, as I only had to move the original brackets out about 3/4" on each side. I hope this helps anyone looking to replace their front cooler seat on their 165.