Just as a follow up on this subject. I contacted DSN and any other supplier that I could find and none offered a steady bar that would fit a hydro car on the LH side. DSN said that they hadn't considered hydro cars in their design. Moss said that they thought their water pump steady bar would likely fit but it doesn't without jamming up against the hydro union and forcing it out of position. I'm going to contact them to see if they could modify their bulkhead plate to overcome this problem.
Just like to thank Spider for his input on this and pictures of his own bulkhead plates he's made for Mokes for thermostat plate fixing.
Until I can drop an engine in for positioning I'm going to pause this problem.
First thing, that solid hydro pipe seems pretty well crushed from the photo, but why don't you just make a bracket that works with your pipework, I would have thought a simple H shape welded to the existing bracket you have with the 2 legs either side of the hydro pipe to hold the joint from the thermostat tie bar.
Shooter