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Discussion Starter #1
Is there a seal or grommet around the two vacuum hoses through the firewall for the A/C valve and vacuum reservoir (see my index and middle finger)?

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Yes there should be grommets there
 

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I posted a similar question a few months ago. I haven’t found an aftermarket Mustang-specific grommet, but picked up some assorted grommets on Amazon that should do the trick. Still need to install. HTH.
 

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+1 see "view A" in the diagram below. I don't have any part number reference. Did not look in the assembly manual yet.
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Discussion Starter #5
Thanks for the input. I have searched the assembly manuals high and low and I couldn’t find an answer. I found where the lines run through the firewall, but no mention of any grommet.
I will use something universal and let you all know if I find something that fits well.
 

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Common chassis grommets will work perfectly.
 

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My originals had grommets, and then sealer applied.
 

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Discussion Starter #8
I ended up using Dorman 02365, which is a variety of grommets. Dorman Products - 02365

The 5/16" grommet was a good fit for the 7/64" hose, which I think most cars have two of. I ended up using a 5/32" hose with a 3/8" grommet on mine for the vacuum reservoir, since I had a good reproduction tilt wheel vacuum reservoir on hand which has a larger nipple but seems otherwise the same as the A/C version for my later '68. They are both a little loose to be a tight seal, but closer than just big holes. I assume the factory doused these with that messy firewall sealer they used.

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I found this - illustration P-5680 which identifies the grommet as Ford part# 380851-S

It's not in any ford standard and utility parts manuals that I have. It is not in the MPC text catalog, so it appears that it was not serviced.

I also found a wanted ad here from way back: Bracket and groomets for a 67 with a/c

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I searched for months for those, but the part number comes up as heater hose grommets, so I suspect the drawing has the wrong number. I have documented dozens of such typos on old Ford drawings. I finally gave up and used stock grommets of the right size.
 
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