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Quote:

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Measured from Mopar stamped aluminum valve covers as shown in above photo.


Thanks for the measurements, that is exactly what I was liking for.

Interesting to see what you mean about the rubber coating from the pic above, I thought the factory ones were all two piece, alloy plate with separate rubber gasket like the pics below, maybe they made a couple of variants, any comments on which work the best? Thanks again.

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mine are rubber coated. I put a little silicone around the hole seal but not where it seats to the valve cover.
Once you install the tubes, orings and tighten down the plug they seal right up.
At least on my car they did.