Go to jdparts.com and free register. Then go to model 2210 tractor, and to "attachments" which will take you to the 246 broom. It doesn't list the 2210 under the 246 broom.
It does list the 2210 hitch requirements under the 51" broom.
May be the hitch for the 51" broom will accept the 63" broom, but some more detective work is in order to find that out.