Something pretty cool I just came across! You might remember a month or so ago there was a kickstarter project for a truck shifter to use in ATS/ETS2, it looks like that project's moved forward! There's even an optional cover for the shifter with the different shift patterns for 13 or 18 speed!
Looks like you'd need to buy the main controller separately (if you've already got a shifter it can be modified, support for Logitech, Thrustmaster & Fanatec) and then the individual shifter knob is an individual part that can be swapped out, sure somebody can correct me if I'm wrong though :p
http://csio.tech/fanatec-shifter-support to preorder
Looks like you'd need to buy the main controller separately (if you've already got a shifter it can be modified, support for Logitech, Thrustmaster & Fanatec) and then the individual shifter knob is an individual part that can be swapped out, sure somebody can correct me if I'm wrong though :p
http://csio.tech/fanatec-shifter-support to preorder