Ordering Cub parts

[karanian]

Inherited a 1946 J3C and attempting to rebuild it. I have a Wag-Aero parts list, a service manual and detailed parts drawings. I am having trouble cross referencing parts in the parts manual with parts from Univair or Wag-Aero. For example, looking for the shock cord for the tail wheel assembly listed as TW-309 on the drawing. I cannot find it on either site. Any help appreciated. Calling Univair tomorrow for help also.
Thanks

 

[bob turner]

 

[huston marlowe]

 

[jimrice]

 

[karanian]

 

[lycominglou]

 

[karanian]

 

[bob turner]

 

[Fifinella]

 

[43-491]