Guess what?.......................By fluke, when I got my Showa shock, it had the purple Hyperpro spring fitted.............apart from getting a specific starting point for preload from someone as Hyperpro weren't too helpful, I have no issues with it.........and frankly can't see or feel the point of having it instead of the OEM one...save your money. AL
My Showa GD041 lower bush also poked:Arghh: Tore the lower end apart, what a mission to get the 2 top hat halves out the bush, removing 2 c-clips and pressing the bushing out went ok.:Grumpy: Is the upper bush the same as the lower bush??? IKO SB12A. My top bush appears OK, but my OCD getting the better part of me, bought a box of bushes- QTY 5, so might as well throw another one in the top end if the bush is the same. I have 3 spare if someone requires, PM me