65 Barracuda Front end Rebuild several questions and a couple of observations

JeffreyLee said
Also, you'll notice in the picture that there are 2 small oblong rubber plugs in one of the backing plates, again, missing in the other side. Where can I source those small parts?

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Those are plugs for the star wheel brake adjustment, more often as not missing. You should be able to find them in the HELP section.