Hi 
Cheepskate alert
I have asked bit over on thesamba 
http://www.thesamba.com/vw/forum/viewtopic.php?t=350008

for a cheeper deal to get my 85 sliding door back in shape I hit total pay dirt with the 2 upper guide bearing
use ANY skateboard bearing they ARE a perfect ID/OD/ thickness but I no one has the neat replacement for the STEALERS $120+ for the main guide bearing 

Any one ever spedn the time to fond a 5-10 compatible bearing to replace the main guide bearing
taling about this one http://members.shaw.ca/trclark/vwvan/P3310001.JPG

one suggestion I did find that is not quite right was here
http://www.mcmaster.com/#3434t23
but they say the bearing is bit thick & not enuff left of the shaft to thread a nout on but otherwise is good fit with a tack weld