Yes do tell!! I also have some parts arriving shortly...
First is all the stuff to do the chain and valve stem seals.
After Helmet's warning I did not get the Febi guides and went for genuine. I would have gotten a genuine tensioner, but they were over USD$400 vs about $65USD for the Febi. Also camshaft oilers.
I won't do this work, but have sourced all the parts for it.
Some other stuff to in the short term. New cap, rotor, wiper blades. Also the camcover gaskets and washers for the chain being done. Thermostat is so I have one on hand if needed.
Also some of the rubber breather hoses for the engine that have gone very hard.
SLS fluid for both the 560SEC and 300SE. I also have the filters around somewhere.
Longer term, new oil pan. Mine has a dent in it. Looks more like a floor jack than collision.
More leather conditioner, not just for the 560, but because I used my last bottle on the 560. Also wear seansor for brake pads (pads around around somewhere), clip to hold visor on and 1st gear start module that I will use that switch in the fader position.
Owners manual. is for a USA edition, but was only about $12 on ebay. Keeping my eye out for a UK spec one.
Hood pads for both W126s. Can't remember which one is in the photo, I think the coupe one.