Here are excerpts from email 'talks' with a Kaefer Kup racer in Germany that helped me with some good info.
"I only used SPAX G616 for the front - for the rear I used Bilstein shocks
and Porsche 944 turbo torsions bars (more due to evolution than any other
reason).
Clearance is not a problem - lots of space left...
The 1st and 2nd place of the German Boxerpokal 2004 (
www.boxerpokal.de) went
to 1200, not 1303 Beetles :-)
But it's easier to adjust the front suspension of a 1303 - takes quite some
time to find a good setup for the 1200 front shocks."
And...
"
For SPAX racing suspension you can look here:
http://www.spax.co.uk/SPAX-competition-page.html
To use them in a beetle you have to remove the torsion bars and replace them
by a axle with ball bearings (hard to explain - especially in english).
I used one 19mm anti roll bar in the front and a 14mm one (Porsche 944) in
the rear for hill races and added a second one for track racing
(
http://www.csp-shop.de/cgi-bin/shop2...&wkid=69585125
440)."
I hope this helps you as it helped me.
DORIGTT