Sorry I can't really help with your bushing problem :/
What you can do if you don't want a short shifter is buy the cheapest eBay one you find, and just use the bushing with cups. It should fit.
Ooooor... you can get a short shifter
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ASE certified Automotive Master Technician.
Porsche Tech in France.
www.benautodesign.fr
Ben-Auto-Design : Performance parts for 9X6 / 9X7
1982 928 S Euro