Same on my 1600. They dont take much weight if you notice as you put the engine back the bar presses up on them. They are mostly there to stop the engine from flapping about and act as alignment points for putting the engine back in.
Hmmm i think ill look out for some second hand one piece ones as my bus is going to get abused a bit more than just a road going bus
Here's one of mine (1 piece) in my 72, still got to remove all the rot and do the right hand side chassis as well yet.
Isn't the backbar different on earlier Bays? Two piece are deff stock fittings for late Lates. It's the rubber engine mounts that take the strain.
They're not VW nuts 'n' bolts but they are tensile. I got them from an engineering place in Kirkby. Two of the washers (smaller ones) are the originals, it was just a quick set up to see how it all fitted after the chassis repair. Here's how it looked before!