Dirk at LWD was able to help me with an alternative brake junction block. We had a few to choose from and I decided to go for this one as it uses the same thread size as on the original block and also the same thread on all three holes. Basically it means I can swap the block easily if I ever find the original one.
There was only one problem....it's Ford.....but, as you can see in one of the is the manufacturer for these blocks seem to be the same, "W".
The block has a hole in it to secure it to the frame with a bolt, in stead of the clip as used on the original.
I modified two thick washers to fill up the hole and to get the new bolthole off-centre, so the block would sit a close to the original location as possible.