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Calum So far people haven't posted issues with them. I use it them for two years (incl. few trackdays). Back then prior buying obviously i also had similar fears, as on first glance they looked rebranded WL com-c, on email inquiry they replied:
"
3. We designed and manufacture these top hats ourselves.
4. Yes, these have been tested to work with the ZC/ZN chassis. We are familiar with the other offset mounts in the market and their short comings and are confident our mount is superior. Our mount has the bearing installed at an angle to alleviate the side load. Therefore, our mount has much lower striction than the competing mounts in the market."
Most slight "issues" i heard were relating buying, like local availability/shipping times or people mistakenly ordering one mount instead of needed both per vehicle, and waiting even more for another separately ordered to arrive.