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What is the size of the bimini top? The recommended size for the 2008 Sport 150 is 54" H x 67"-72" W x 6' length. Per your notes, I think you may have a top that fits 73"-78" instead which would be too wide. Have you contacted the dealer/online retailer that you purchased the top from?

I have a couple of example photos I can email or you can view them on our site at:

http://www.carvercovers.com/bimini-to...o-gallery/

Sort by Type (Round Tube Bimini Tops)
Sort by Manufacturer (Boston Whaler)

One of the photos shows an example of an inside mount (of the rails) and the 2nd photo shows an outside mount of the rails.