In Mick Hemmings exellent gearbox rebuild video, he mentions that the bushes in the 2nd & 3rd gears which spin on the shafts should be free floating.
I replaced the gears in my MKII with an almost new set from a MKIII from Fleabay. As fares I can see, these are 100% original, but one of the bushes is definitely not free floating, while the other is a lovely sliding fit.
How critical is this? I could make it a floating bush with a bit of wet&dry and some time.