Rear seat location

[gpat@earthlink.net]

I need the rear seat bolt whole location. Maybe a measurement from front to back. I can get whole pattern from the seat itself. Have to make a support bracket for the underside and adapt it to a truck floor because i have no floor. Thanks for your help. Also will a truck replacement sill work? Is the sill cut out for frame or dose the frame tail down and go under sill. Scratching my head. Pat