I think youre best bet is to call Chuck Yates at Seadek. He'd for sure be of help to you. I ordered mine a few months back, and they didn't have as many sizing options as it looks like they have now. I have an 08 LSV, and the size they had fit perfectly. But, like I said, Chuck would be the perfect guy to talk to. I don't have his number right here, but just search the forum for Seadek, and you should find it pretty quick. He's really good at getting back to you also if you miss him.
Hope that helps!