I have a 1986 Sea Ray Weekender 230. I want to swap out my two seats in the cockpit. They are the kind that are back to back and spread out to one long platform. I have been looking all over the place for replacements but can not find any. The problem is everywhere I look, I see base sizes of 10 or 8 inches. I measured mine, it is about 23 inches. Am I measuring wrong. I am measuring from the floor to the top of the base, not the top of the seat. The guy in the store told me it was pretty much a standard. Does anyone have any experience with this? Thanks.