I think the Keel Guard brand is all the same width, and for your application i think they reccommend the 7 version. But, having used both the Keel Guard, and the Hamby, i would reccommend the Hamby over any other. contact your BCB dealer and inquire about the price, and i would reccommend they install, as it can be tedious, but well worth the investment ! imho, D.