Manifold heater switch

[dplum]

Hi, does anyone know where I can get hold of a new ( or guaranteed working used) manifold heater switch? It's the one on the left of the thermostat which turns on/off the choke and manifold heater ( not the coolant temperature sensor).
It's for my 1988 1.9 dg petrol engine with pierberg 2e3 carb.

Thanks!