Your dilemna is not new and in fact I think there is room for a product in this hobby that uses an optimized rubber bushing, preferably something like the threaded rod ends and Spohn/Jonny joints that can be used universally. OEM rubber bushings have come a long way since the 70's and the rubber can be tailored for specific durometers. However, nothing like that seems to be available now unless you are willing to somehow adapt an OEM which would be a expensive custom machining project as well as its pretty difficult to obtain the bushings as they get destroyed in most cases trying to remove them.
Howe racing does sell a threaded rubber bushing, but it is very large (3/4" through bolt and probably 2.5" in diameter) and heavy.
there is a lot of rubber in it but it seems to be of a pretty heavy durometer.
Another thing to think about is shock mounting - is you are OEM its probably okay but anyone not using OEM mounting is usually relegated to the 1/2" spherical bearings. A LOT of NVH comes through those. Some more universal aftermarket adapters that incorporated isolation might be nice. I used some AFCO poly bushings to replace the sphericals in my aftermarket coil overs but they are still pretty harsh
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