Get one to suit a 33gtr and everything will bolt up. Go new though as usually you get everything you will need, instead of going 2nd hand and having stuff missing
If you're not fussed about brands, either Castrol VMX-M which is a 75-85, or Penrite Sin manual Trans which is also 75-85. I use both these and don't have any problems in the gearbox.
Diff wise, penrite reccomend 80-90 oil front and rear
Good to see some 32's getting some work done to them, don't see many down here anymore. Did spot a 32GTR chasing a S15 yesterday though.
Mine on the other hand is moving slowly, Work is way to busy to make any progress on her
If it is the input shaft bearing, if you keep driving it the bearing will eventually collapse and quite possibly wreck a gear or 2 costing you more in the long run. Did you replace the clutch throwout bearing that sits on the fork?
If you wanted to get really anal you could remove the caps one at a time and bead blast them. You can't interchange caps from other diffs as they are matched to the diff housing like a girdle is in an engine.
As for the glue, scrap as much off as you can and give both surfaces a rub with an oil stone which will make it nice an clean,
Once you have your vehicle inspected by a workshop, and they give you a further improvment notice. You have to go back there until the sticker is taken off.
Next time it might pay to go somewhere else