Bosch spark plug - fits all years 84 thru 91. Sold individually. Please note that Bosch has started to sell these plugs with the normally unnecessary connector pre-screwed onto the end of the plug that connects to the wire. When you use these plugs with most wires, including Bosch wires, you will need to remove and discard these little connectors before installation. WR7cc - note that the "R" denotes that this is a resistor plug.