Many uses in many models. You should carry a spare in your glove box along with some fuses.
1970'S Through 1980's Universal 5-pin "Ice Cube" Relay
$16.80
SKU:
ELT-5PINRELAY 
Product Details
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Uses include the above, plus in the D-jetronic cars, this can also be the fuel pump relay as well as the critical relay for the ECU ( located under the dash below the heater blower motor.