Hey Shipwright! My best buddy lives in Grand Jct.
He drives a truck to Denver and back for Saia Motor Freight.
So your saying that all of the box fits in the opening, none of it fis under either the top or bottom lip. Is this correct? And I know the trim peice your refering to. It is very thin! I thought it probably should fit like that, but it sure fit tight, and seemed that when the bottom holes were lined up, the box was angled upward, but maybe not. I will try it again.
Thanks!!
KT
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1949 3/4 ton Chevy Truck


1953 3100 with 1957 235, T5 and 12 bolt 373 rear