It seems like the head gaskets are in short supply. I need a spare one for my late 280SL and it is not available although several places offer them for sale. when you place an order, they come back after a couple of days and tell you they are out of stock. The last one I got was from K&K. All other places, no luck.
The only ones out there for a 280 are the early ones. I have two of these, that are no use for me.
I am planning to go to a local gasket maker, whose specialty is composite gaskets, take an old gasket and ask them for a cost to duplicate it.
If anybody else is interested, let me know. We could get a batch made which could bring the price down.