kev, this is how i got it, with bost swan neck and GEC Z9530, bottom gear, 2 part cell

How did the arm become snapped?

think they dropped it on the back of the lorry

You have done a great repair job on it. It looks to be a single mould lamp post?

it does have a removable bracket, well it did when it was new, the grub screws allways rot solid on these, and they point the gap with resin cement mix, i had to hacksaw through the joint to remove the bracket, and then drill out both grub screws, then weld on a replacement narrower pipe to slide in the existing sleeve to re attach. I had to remove it as the door was to the rear, and i needed the bracket in the vice to repair it, easy it was certainly not