[Shelboss]

Hi Doug, did you talk to Gordon? Yes the Koni top hat cannot be used, but you can cut the tube off the Jag Girling top mount, use a spanner to disassemble the shock, and slip the sleeve on to the shock. The spring and lower threaded spring perch can then be put on. The parts need from Koni are the sleeve the lower perch, and a nylon 2.25" to 2.5" spring adapter. With the 10" length spring, this will sit about .5" higher than Jeff's car at the lowest setting. To go lower would require using 2.25" x 9" long springs and having an upper perch custom machined. According to Jeff, the HD Contemporary used 300 Lb/in springs which were a little stiff, so you are in the ballpark!
For reference, the Contemporary ride height gage is set to 12" with the shorter half shafts, the Koni's are 9" compressed, 13.25" extended eye to eye.