Kataplun,
Watson Street works makes a kit that they sell online for the VW Beetle.
Here is the link:
http://www.watsons-streetworks.com/vw.html
Price is $275.00 US. I haven't used the kit, but they seem to have a good reputation with people I've talked to who have bought things from them.
I plan on buying the wiring kit from them shortly for my Ghia...
Shipping may be a bit of a deterrent though...
Cheers,
Doug