I’ve been upgrading my Ultimaker again. Out went the old pololu X and Y stepper drivers, in went the SilentStepSticks. As you can see by the mainboard version, it’s an oldtimer. And it still has the original silicone sleeve for the heater block too. Rumor has it that sleeve was cast by @Erik_de_Bruijn from @Ultimaker himself 
Also thanks to the guy who wrote https://ultimaker.com/en/community/11571-step-by-step-installation-of-silentstepstick-drivers-on-umo
