anyone know if the diff centres are the same between 1800cc kombi boxes and 2.0L? otherwise, anyone have any internal crownwheel dimensions and number of bolts?

I have no idea
From over hearing other people though I'm sure 1.8L and 2L GB diff's are not interchangable if that's what your doing?

I'm trying to avoid dismantling a good 091 box in order to measure the centre up for an LSD conversion, I do however have an old 1800 box condition unknown that I don't mind dismantling....

bit of a shame