Most likely the weatherstrip that Uhaul
used was the closest dimension that was available at the time, and as far as I can find the AS 1456 is as close to the required dimensions as possible, but not perfect. The Lisle lock strip tool that I used has 2 tips with 4 possible size openings, and can be installed on the handle either straight or at a 90 degree angle. It was still somewhat of a struggle to get the window into the weatherstrip, and the lock strip in place. As I recall I put the 3/16" groove of the weatherstrip on the window.