ST-1 and ST-2 can use driver's door passenger window control, driver's door passenger mirror 4-way adjust (with the selector switch moved to the left) and the ESC on/off button.

ST-3 can also use the extra buttons on the steering wheel.

Speak to Chris at Veil Tuning on Facebook, he fitted mine and is one of the foremost fitters in the UK (he works with Autowatch and owns fast Fords.)