In process of replacing the shift console on our '78,  I'm having some trouble with the heater/ac control. I am replacing  the control.  I'll list my problem areas and/or questions:
.  The vacuum hoses go into a rubber like piece that attaches to the back of the control - how do you get the round speed nuts or whatever they are called off the two mounting studs?
.  There are four hoses connected to this rubber piece - There is another connection point that looks like it should have a hose connected to it,  but can't find any sign of a loose hose. 4 hoses/5 hoses??
.  IF,  I decide not to work anymore on getting the speed nuts or whatever they are called off and go ahead to take the next level of the control off (held in place by two screws) what do I then get into?
.  Could the vacuum hoses (4 or 5) be hooked directly to the nipples on the back of the control?  This would eliminate the rubber piece.  I'm sorta liking this option.

I can't find anything in the AIM or shop manuals to help with the above.

Thanks for reading.   Take care  GaryC - '78PC - Franklin, IN