Sony CFS-W504 and Sony CFD-10 belts

Looking for buying options for Belts for my 

Sony CFS-W504
Two Belts : 4-934-520-01   and 4-934-521-01
Two Belt (Midway) :  4-928-974-01

Sony CFD-10
One Belt : 4-928-951-01   (Belt Capstan) 
Two Belt (Midway) :  4-928-974-01