Review on 🚗 HELLA 007794021 12V 20/40 Amps SPDT Relay - High-Performance Automotive Power Switch by Roy Niemeyer

They seem to be a lot better than the ones you can buy for $2-3. They turn on with a reassuring click and appear to be very well made. They have a resistor in parallel with the coils to prevent internal arcing, resulting in longer life. I currently have 6 of these and I will buy them again if one of them fails (which I doubt).