DavideAndrea, My ad blocker (or something) is blocking your picture so I don't know what your point is. But I'm pretty certain there were no barrier blocks that came standard in any of the old Jeeps. Between my father and I we've owned five of them made from 1944 to 1964 and I still have full sets of manuals for all of them. I went and got out the 1944 manual for the MB that we used to own and it does show that the wiring used ring terminals and screws in the ignition switch and so forth but I don't think there were any barrier blocks in them and there are none shown in the pictures in the manual. My '53, and all of the normal ones that I have seen, uses Douglas connectors and Canon plug style MS connectors for all of the standard equipment. My '53 only has the BBs because of the military radios systems that were added to it to convert it to a model AN/MRC-35A. I used to have pictures online of it and there is one other known example (in Iceland!) but all of the pictures seem to have disappeared. You can search for AN/MRC-35A and see if you can find any of the many pictures that used to be online. There are other similar (not 35As) MRC radio jeeps out there too. And I do have the manual here somewhere, I just need to find it!