You are correct with needing the "Shock Stud" (picture 3 above... and link below) along with the Caltrac lower shock plate. It is exact;y what I am using with my Caltrac bars.
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NOTE:
The "Shock Stud" excepts a shock absorber without the metal sleeve in the lower shock bushing.
You may be able to modify your existing shocks to work on a stud mount by using the procedures shown below:
I was able to remove the metal sleeve that was in the lower rubber bushing by...
1 - Taking a very small flat blade screwdriver and prying the rubber bushing away from the metal sleeve just enough to squirt some PB Blaster (or any other type of lubricate) into the space between the sleeve and the bushing (I did this in a few spots around the circumference of the sleeve).
NOTE: Be very careful with the placement of your hands/fingers so you do not hurt yourself just in case the screwdriver slips! ? ?
2 - I then placed the portion of the bottom end of shock over a deep well socket, so the lower bushing was against the deep well socket... but the metal sleeve would slide into the socket as I pounded on the other end of the sleeve with a hammer. Once the metal sleeve was even with the bushing, I was able to take HD vise grips and grab the other end of the metal sleeve and twist/pull it out. The bushing should stay within the shock.