Long needlenose pliers.
I have a 12 inch set of needlenose and they allow me to connect/disconnect the vacuum lines under the intake with no problem. Should work on the backend where you can't fit your hand.
'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.