thanks andrew it is not easy to see what it is, so I hope someone can tell me with what no they started or in what group this no could fall, but thanks anyway.
I had some upholstery work to do with the 2 chairseats in the cab. I had one old springseat from dirk, but these were rusted away nearly. so I strat looking for a replacement springs. Ifound them ad a locale seatshop. they are a littlebit bigger in diameter but work well. I sandblasted the old frame and made a new one for the otherone. Then connected the springs to the frames by ironwire. painted the whole thing with primer and put a pillowcover over it so it is easier to put the kokosmat on top, so the springs not leave a mark in your bummm.

I had bought some nos seatcovers from dirk and it took some time to put them over the seats, but they look very nice and sit like a sofa.
Oh here are some pictures of the radio junctionboxes and the interior.
cheers jaap