My 54 panel truck has after market bucket seats installed.
They are way to high because of the under seat base.
When I try to get out of the truck, my head hits the top door jam.
I'm 6'2" so I have to duck down to get out or wear a hard hat.
Sitting on the seat, my eyes line up with the upper edge of the windshield.
I do have the original drivers seat that I plan on reinstalling, along with the auxiliary seat.
Spec says: original stock seat height for 53 panel is 14 3/4" from floorboard to the top of seat cushion.
53 panel
Stock seat height Dimensions, pdf page 86, actual page 127
You might have to fabricate your own under seat base.
The original seats dimensions are that way for a reason.
i.e. easy Ingress and Egress from the vehicle and proper eye height.
For the average Joe.