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14mm threaded, long reach. Used with a 21mm spark plug socket. A 'Super' spark plug with Cu-Electrode/copper core.

Bosch, copper core spark plug. WR8DC

#931646

Stock:Yes

14mm threaded. short reach, 12.7mm (1/2"). Used with a 21mm spark plug socket. A 'Super' spark plug with Cu-Electrode/copper core.

Bosch, copper core spark plug. WR7BC

#931640

Stock:Yes

14mm threaded, long reach. Used with a 21mm spark plug socket. A 'Super' spark plug with Cu-Electrode/copper core.

Bosch, copper core spark plug. WR7DC

#931645

Stock:Yes

14mm threaded. short reach, 12.7mm (1/2"). Used with a 21mm spark plug socket. A 'Super' spark plug with Cu-Electrode/copper core.

Bosch, copper core spark plug. WR5BC

#931641

Stock:No