is that 5" on the new beam as I see in your info your year of van is 68 which I'm now assuming is a year of build not model in which case it will be a early bolt pattern therefore wont fit.
Ah see now it deepens its registered sept 69 so that could mean its a 70 good then it will fit but it could also mean its a 69 bad cos it wont fit, what model year is it?
Just had a look at the M code plate and the serial number is 219232869 - guessing the 869 is aug 1969.
Thanks for the info, from the diff in my measurements between the top holes and bottom holes (ie. 2") it's. looking like I'd be using the four corners not the top four holes on the plate.
I've given the measurements to the guy who's selling the beam so I'll wait to see what he comes back with.