Couldn't find the belt for our 20+ year old vacuum anywhere else. Found it quickly on this site and vacuum is back as good as ever.
Blower pulley fd/fs450, bd/bh4000, bw 55
Blower pulley fd/fs450, bd/bh4000, bw 5501, 5002, 4502, & ctv1
Buy this part and as many parts as you like and pay only $9.99 shipping, within the Contiguous United States.