check the copper back of the wax casing is stamped 82C and you'd need to cut that excess sprung disc off the backside so it clears the thermostat housing.
https://www.micra.org.uk/threads/pollymobiles-rebuild.35251/page-95#post-633626
radiator is held by that top panel. remove all the bolts attached to this top panel such as 4 bolts at the top, unbolt the bonnet latch and the middle support beam, unbolt the shield panel to the left of the radiator. then simply lift the top panel up off the rad
