Can't remember which forum I saw it on, but you can get new connectors to go inside the plug. I.e. pull out the little connector from the plug and crimp on a new connector which you then slide in again.
Alternative first aid is to use those mini spade connectors (about 3 mm wide), previously common on car speakers. They seem to fit perfectly well. Unless you are in a guaranteed dry area, you'd have to cover it with something waterproof and removable, like vulcanising tape.
In the FSM, the Spill Valve (SCV) plug is listed as 90980-11155 , and it's available from yamayama. And it looks like a more recent car has the same plug for front clearance lamp, according to partsouq.