Hello Ewen
Welcome to the forum !
I don’t have a concise answer
I have a swing arm 56 A10 with what I think are original crusty rear shocks and a swing arm 54 B33 with new repro girling shocks.
None of the above hit the hardware for the rear passenger footpegs when on the centre stand. I’d say a good 5/8 clearance.
Now , if you haven’t already done so, get over to the intro page and tell us a bit about yerself the bike and stick on some pics of yer bike while your at it.
Snapseed app will sort you out for re sizing pics
Wiser folks than me will chime in I’m sure.
S