Tops will be 50mm (same as L model) and bottom will be 52mm (L is 54mm)
I'll hunt the triple lip seals I have in the cupboard and tell you who makes them (got them from blighty).
all internals are still available and worth replacing - overhauled mine about 14 months ago and are still solid
Just under the calliper mounting brackets if you have an adjuster they are SP model (most sought after). Callipers are 62mm spacing so MC28/21 fit straight on
You can also get Tokico 6 pots that bolt on too (got on mine) and there are a few other options too....
The wheel pattern will be well off your NSR wheels so recommend you make spacers up to fit your OEM one back on, if I remember rightly the spindle is 17mm.
Do have them re-sprung though, your going to get a lot of "chatter" otherwise and high speed tank slappers
, once that's sorted your going to notice how soft your rear shock is 
MM!
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