Here is a link that may help you find an alternative. More expensive and no ball bearings.
Phenix Engineering Billet Shift Bushings
You can also find a basic short shifter on EBay for $50 if you search "Porsche 997 shifter" Obviously not as good as Ben's but....
I hear rumors that Ben may have a new project. He is actually tinkering with flat engines & Boxsters again - a 4.0 L engine version.
Here is a related story:
https://rennlist.com/forums/996-forum/992759-update-on-the-lne-4-0-a.html
Just feeding the rumor mill :-).