replacement parts

I want to replace the hatches on 340 Express Cruiser, but I am overwhelmed by the variety of choices available on the market. Not to mention the difference in sizes and measurements. Is the there a location (publication / website / phone number / commercial company with experts etc...) that...

Hi Everyone! My first time on a site like this - hope it helps - I've googled, I've "ebay-ed" I've searched dealerships - I NEED TO FIND A REPLACEMENT LADDER FOR MY 1994 220 SEARAY BOWRIDER - there's got to be one out there somewhere...or at least one that would work. I've checked with a Sea...