Mike: I made an effort to locate some suspension blocks some years ago, without success. I did find a pair available on the West Coast but the cost I thought was too high for their probable use.
Not to worry. I started thinking 'outside the square'.
It is possible to get them made for a lot less cost (than old originals) from new rubber, which may be of a distinct advantage.
A couple of things for consideration:
1. You need a pattern off a borrowed original. A lost wax type of pattern should be OK for the purpose.
2. You need to find someone who will make them for you. That should not be too hard. There are should be a few companies in your City that are capable of this. Any of them that make custom engine mounts for vehicles that are re engined are also capable of making suspension blocks for a 6.9.
I have seen a large petrol GM V8 for instance, installed in a Toyota Landcruiser.
3. You need to know the durability resistance of the rubber. If you don't, the manufacturer of the engine blocks should be able to give you good approximate advice, anyway.
4. There is a simple piece of metal cast into a pair of the blocks, but I don't know if they are for the front or rear. That should not be too much of worry, and that should be quite easy to get it fabricated.
It may pay you well to make a few inquiries in this regard.
Having said all of this, I have never heard of any 6.9 owner being forced to install these blocks 'on the road'. Most comments I have heard are that they a real pain in the proverbial to install.
The only real reason I suspect that they were made at all, is that MB installed them prior to leaving Sindelfingen, because the suspension would go down slowly during the time the car left the factory and delivey to the customer.
MB in their wisdom saw that they may be useful in an emergency.
