Alright I am trying to get the headlights on my 75 working but I am running into lots of problems. The driver side actuator is bad it will not hold vacuum on the green hose the one used to open the light. The instructions on corvette 101 say to replace the grommet I am a little unsure of what its talking about can anyone clarify that for me. The back side with the red hose holds vacuum fine so the diaphram is good.

Probably talking about the rod seal, Ive also heard it called a "witches hat".  http://www.ecklers.com/product.asp?pf_id=A8263&dept_id=1476

When you remove the dust boot you will see the rod seal. Careful bending the tabs that hold it in. They will break - only bend as much as necessary. 

This is the kit I used on my 71. Not hard to do. Part #601-493

my7T12008-03-25 07:28:47