[GreenKeys] ISO TTY Model 43 Ribbons

[Tom Lake]

Does anyone know of a source for Teletype Model 43 ribbons?  
Ribbons for my ASR-33 are easy to find but I’m coming up
empty for ribbons for my 43.  Also, is there someone who can 
work on 43 KSRs and the separate paper tape reader/punch?
The 43 KSR seems like it would be much easier to maintain 
than the 33 since it has so few mechanical parts.
Thanks in advance for any leads on either ribbons or repair!

Tom L