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That's funny, I recently purchased a 1968 Whaler "Sports" (I think they changed it to 'Sport' at a later date?) model. I have a custom center console and a RPS that stands about 36" high measured from the floor of the boat. No railings, same as yours.

I ordered a cover from these guys on eBay. Shipping has been slow. I think they make them to order? I'm hopeful it will be a decent cover. I'll let you know how it works out and provide some pics once I finally receive it. It did say in the auction it would take 15 days to ship. Here is a link. I can't say anything more about their product until after I receive it. I paid about $175, less than the buy it now price. They accept best offers.

http://www.ebay.com/itm/330371960050