Possible good news.I've had a reply from Wemoto about GL650/121cm cables.I'm sure,"Ralph" won't mine me re posting,
Thanks for your email, firstly I have to thank you and your members for the positive feedback we've had regarding our Slinky Glide Cables. I'm sorry to say we don't have a Slinky Glide cable available at the present time which has a length of 121cm. The closest I have found is listed to the CX500 and is 100m long,too short.
However I have contaced our Product Manager who is
going to get a batch made up. this may take a couple of months but they will
be available in due course. I'm sorry I couldn't help you further on this occasion.