You can email Kerscher in English no problem.
info@kerscher-tuning.de
I have found Emmi and Monica very helpful and there English is good. Better than mine possibly. 0049 8727 968812
K. stuff is top notch for the money IMO. WOW is all I can say (2.5yrs later) about the effect there struts and F/R anti-roll bars had on my '79 '03's cornering ability and ride comfort. If you plan to keep your Beetle (my own way of justifying any expense) go for the finest parts you can afford. A delay can be an earner. On the other hand, TopLine shift a LOT of strut kits to folks, some on here who are very happy. On my third hand, there is other makes who have made stuff up for Super's, only Leda
springs* to mind but there is others out there- no prices floated that I've seen. Nothing any good is cheap.
I was billed 2/3 of the advertised prices. My first order was through the late GCC in Essex. I was billed directly by Kerscher, I doubt GCC got a comission due to poor (at the time) service.
*
Matt