Refering on this thread, we only talk about the Rad bikes, I don't know KT systems or other system, they may be different protocols. I'm sure for Rad, we can do compatible because WE MADE THEM. you can give me the series number on the back of your Rad display. I check in my system and made the compatible one as you request.
As for "upgrade", I don't know your "Upgrade" includes, in my opnion, you by a color display replace the LCD one , that is an upgrade, and of course it will show more content than old one.
If you do not like the process on buying them by email, I would only say sorry for that , because we do it as our AFTERSALE PROCESS.
I only take this out as an option to have your display replacement.