First of all, welcome to AF!
Here is one of a a '79-'83 transit double cab wrecker:
http://mobile.de/SIDg6lwYTHHFHj6MbIX...1111166940214&
It's not too bad though, for 3900 euros.
This one's a bit cheaper, and shows the rear bulkhead and the arrangement of the auxiliaries on the chassis.
Don't worry about it being a mk I, everything from the a pillar back is the same as your '84 model
www.marktplaats.nl
on the home page select "auto's", then "oldtimers"(in the right column when you scroll down). In the query field (under "alles") type transit.
Its the middle one of the five results("ford transit 150 bj '72 open laadbak"). Select and scroll down for photo's.
And we would love to see some pictures.