Im not sure the 60mm GB will fit as nicely and the 50mm will be a tad narrow, in an ideal world I'd have black guards as well. Will mull it over a for a bit longer. 53mm Bluemels might do the job if I can source one of those extender things you used. What are they called again, rack extenders?
@edscoble Very nice, I may have to bite the bullet and get them for my Surly.
Where did you get them from, I can't see any UK stockists?