Drag Specialties Pair of O2 Sensor Plugs 18 mm x 1.5 mm for Harley Davidson

Bassani 18mm x 1.5 O2 Sensor Port Plugs - 1802P

V-Factor 95133 Single O2 Sensor Plug 18mm x 1.5mm for Harley (SOLD EACH!)

Drag Specialties 02 O2 Sensor Bung Plugs 4 Harley 12Mm 12X1.25Mm X2 Pair

Pair 18 mm 02 Oxygen Sensor Port Plugs / Plug Set of 2 Harley 65835-09 Exhaust

2Pcs Universal O2 Oxygen Sensor Thread Nut Bung M18 X 1.5 Stainless Steel

O2 Oxygen Wideband Sensor Exhaust Downpipe Blank Bolt Nut M18 x 1.5 Turbo

Standard M18 x 1.5 Sensor Plug Cap with Copper Washer Universal Fit Motorcycle