Anyone out there know if the bulkheads for the 17 and 17LT are interchangeable? I am building a 17 and am ready to install the bulkheads. I test fitted them at the correct locations and they just don't fit right. They are a little small in width and about an inch short in height. The packing tape that was wrapped on the bulkheads was marked LT 17 so I am assuming I have the wrong ones.