Minispares show this rocker for wipers if that helps (Arwyn did mention Mini, possibly Cooper)
https://www.minispares.com/product/Classic/Electrics/Switches,%20stalks/13H6343.aspx?0912&ReturnUrl=/search/classic/switch%20.aspx|Back%20to%20search
Unfortunately it's a one speed switch - 1972 Mog has a two speed motor.