Zenith12
Mark,
eBay is one place to go to get a Legend II bag topper (part no. 191888).
The Tradition 3CB was produced from 1979 to 1981. The serial number on the fan case will help decipher the age:
F - if the sequence number is preceded by this letter, it was produced in the 1979-80 season (cleaner may have the following traits: smooth wheels, smooth foot switch button, 10-blade aluminum fan, lock on headlight cap, inside speed switch)
G - if the sequence number is preceded by this letter, it was produced from summer 1980 to winter 1980-81 (cleaner may have the following traits: treaded wheels, smooth foot switch button, gray 11-blade plastic fan, speed switch on fan case)
H - and if the sequence number is preceded by this letter, it was produced from spring 1981 to end (cleaner may have the following traits: treaded wheels, ribbed foot switch button, gray 11-blade plastic fan, speed switch on fan case)
~Ben