Kerscher modified the design slightly a few years ago- The elongated hole was extended towards the strut body, to gain more negative camber, possibly based on feedback from the 944 stub conversions which need that bit more..
Mine came with the guides for VW Golf/944 type eccentric bolts to make adjustment very easy. I've since removed that arrangement and cut for a max of ~2.5deg -ve camber at the strut, with the centre bolts set to minmise the front track.
The range was too small for to meet everyones needs, they were perfect for stock spindles.
This is how I adjust the struts, takes about 15mins each side:
