I did get your email, but was out of town for a few days, and didn't get to email till yesterday. I see you've resolved the coil issue. Sorry I couldn't assist in time.
When you say you've lost the ring for the hyd bottle, are you meaning the retention spring? If so, I would think a zip tie would hold sufficiently until you could find a replacement spring.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.