Bilstein Replacement Shock Boot

I'm working on my 1999 Mazda Miata suspension system and I'm replacing everything. I wanted a nice durableshock boot that would handle the abuse endurance racing has so i went with these. I have not used them in a race yet but they look very sturdy. Also this was the best price i found o for these and shipping was great. I expect these to last longer than the OEM ones I had.