You're going to struggle (if not impossible) to find an off the shelf gun case that will suite your required length.
The longest Pelican make I think is the 1770 which is rated at 54.5" internal.
I have a Plano (poor man's Pelican) which is around 1320 mm (52") internal and a Flambeau at 1300 mm.
The only way I can get my F Class rifles to fit in the Plano is to remove (easy) the adjustable butt plates.
The Plano is a pain and when I had a twin cab the easiest place to stow it was lengthwise in the back. Easiest place to open it as well. I rarely use it and go with a large gun bag for day outings.
Both my Plano and the Pelican 1770 are monsters with wheels (you need them) and breather valves for air travel.
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