The EMTB mode can be installed on any Bosch CX motor. It will not go onto a HS (speed) motor or an active line motor. 'The common brands that use Bosch bike components are Trek, Raleigh, Bulls Haibike, Kona, Riese & Muller, Moustache, and Tern (I am sure I left out a few). Go on line and look for a local shop that carries one or more of those brands. Surely one of them can help you.
A word of caution, some love the EMTB mode. Others, like me, prefer the old sport mode that allows them to control the assist level rather than having an algorithm dong so. I find that, while EMTB is convenient, I get more miles on a charge by manually selecting the assist level during a ride. Be sure what you ask for.