Parts from ECS Tuning showed up yesterday. Got four new valve keepers, the "closing panel" for the firewall (that plastic thing behind the engine that falls apart into little pieces for older E39's), and a new blind plug where the TDC Locking pin goes.
Finishing up installing all the valves. Putting new valve seals on all valves. Valve goes in, protective sleeve goes on the valve stem, new seal goes on, then is fully seated with a 9mm or 10mm socket. No pounding or heavy force needed. It just sorta "snaps" on there.