by Bob Gagnon on Fri May 22, 2009 2:42 pm
Gordon-
Yes, that is the racing catalog, note on page 13 that the top nut you used is listed, as well as racing strut inserts 8610 and 8611.
The link I posted earlier was to another edition of this catalog that is shown on the Koni website.
Note, also on page 13 of the catalog you site, there are instructions on how to install an 8611 or 8610 racing strut insert into an existing strut and this is essentially the process I used to fit my struts with inserts.
For my 914/6, because the double adjustable 8611 was not available at the time, I used the single adjustable 8610 installed into Koni S struts.
All I had to fabricate was a simple, drop in spacer of aluminum that allowed a gentle press fit when the top nut was tightened on the insert. It worked great, was simple and I had an external adjustment. If I did it again I would go with the double adjustable 8611.
I would talk to one of the Koni rebuilders about your rear shock problem. They may have a solution.
Note, that if you revised the 911's rear upper mounting design, there are a lot of racing choices. The Racers Group in Sonoma used to make such a solution and perhaps the Koni rebuilder at Infineon raceway may have worked with them on this since they are both on Arnold Dr. in Sonoma. Just a thought.
Cheers, Bob