I can not find where the 16-42BL02 will fit the 264-H.
16-42BL02 Replaces 06-42BR01, 16-42BL01, 36-42BL01
The blades listed for the 264-H are models 79252 and 79253.
Take a look at the illustrated parts lists athttps://lookup3.toro.com/partdex/index.cfm?xCaller=Toro
and see if you think it is doable.
You can download a 110 page Attachment Interchange from the Files ofhttp://groups.yahoo.com/group/wheelhorsetractormanuals/
It is near the top and named "AA WH Interchange 1955-2000". You can enter the blade model numbers and search for the application. It fits too many tractors to list them all here. There has to be someone somewhere that wants that blade and you may be able to trade with a little luck so Good Luck.