Vacuum motor grommet

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My 70 Dart has the vacuum controls for ac/heater. I was wondering if anyone knows where to get the right grommet for the vacuum motor by the heater box. Mine ripped years ago and I put in a grommet from the hardware store that was loose. Then I sleeved the pushrod with a plastic drip hose to take up the slack. Doesn't work that great. I have to reach down and wiggle the rod to get it to move. I've looked around but gave up.
 
Here's a couple pictures. I was trying to measure it. Looking inside the hole with a flashlight it has 3 narrow raised rubber bushings to cut down on friction. Also looks like a special double seal.

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I have a heater/ac box in the shed, I'll look and see if I can see this. How big is it and is it external?
 
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