Doing the calculations between the 53.5'' 50size Zero & the 82'' Zero the 89mm spinner they do would be the same relative size as the 57mm is on the 53'' Zero.
If you divide the 2100mm wingpan by the 1360mm wingspan you get 1.5....
If you divide the 89mm spinner by the 57mm spinner you get 1.5....
I'm definately no einstien but I think it works out ?.
Therefore if you got the 89mm it would look the same for the relative size as mine.
Sh#t hope that makes sense better go before I get my self in any deeper.
All the best Steffan.