Good to know, thank you. Your mounts look to be quality, and the price is pretty great too. I've been considering yours vs the cp-e mounts, but one of the main reasons that held me back on yours was the lack of durometer rating info. I'm going to have to really weigh my options now!
You can have a larger diameter bushing with a high durameter, and have LESS vibrations, than a small diameter bushing with a low durameter...
Another way to look at it... Assume two tires are the same durameter. Both are the same outside diameter. One is a 15" wheel and one is a 20" wheel.
The 20" wheel setup will ride much more hard/firm, even though the durameter is the same.