All,
Here's updated links because some have changed from previous research ...
UK source, UK made:
http://www.brickwerks.co.uk/index.php/selector-fork-repair-kit-t3-4-speed-syncro.html
US source, UK made (same product as above):
http://www.t3technique.com/accessories/shifter-guide-repair-kit/
US source, US made:
http://www.md-machinist.com/vw-products.html
Complete new selector shaft but presently out of stock:
http://www.van-cafe.com/home/van_1223689737929/page_1612_1246/selector-shaft-front-syncro.html
Take your pick.
Cheers.
Ken