MK3 ex ambulance where is the stamped VIN number

[Barti]

Hi all, I was wondering if anyone could tell me where I would find the stamped number as I have found the riveted aluminium plate but not the number that is apparently stamped somewhere on the body/chassis of the vehicle. My ex ambulance is from 1989 and has a modified fiberglass body but the rest seems to be a standard transit van

[dumper]

My mk3 I think was stamped into the passenger side footstep panel it’s possible that it’s long gone if it has been replaced due to rotting out