Analogs of : NGK - 4521
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NGK 4521 
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Spanner Size: 20,8 mmSpark Plug: Nickel Middle ElectrodeThread Size: M14 x 1,25
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Connector type: M4/SAEElectrode distance: 0,7mmPackaging height: 2,45cmPackaging length: 8,65cmPackaging width: 2,45cmPacking Type: BoxQuality/ Grade: Nickel GEResistor from: 6kOhmResistor to: 15kOhmSpanner Size: 21 mmSpark Plug: 1 - Earthed ElectrodeSpark Plug: Copper Centre ElectrodeSpark Plug: with gasket seatSpark Position: 1,5mmTechnical Information Number: RN2CThread Length: 19mmThread Size: M14x1.25Tightening torque from: 25NmTightening torque to: 30Nm
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Connector type: Crimped SAECountry Specific Design: JapanØ: 14mmfor OE number: N3A118110Gross Weight: 49gSpanner Size: 20.6Spark Plug: 1 - Earthed ElectrodeSpark Plug: Platinum Middle ElectrodeThread Length: 21,5mmTightening Torque: 22NmWeight: 46g
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Connector type: M4/SAEElectrode distance: 0,7mmPackaging height: 2,45cmPackaging length: 8,65cmPackaging width: 2,45cmPacking Type: BoxQuality/ Grade: Nickel GEResistor from: 6kOhmResistor to: 15kOhmSpanner Size: 21 mmSpark Plug: 1 - Earthed ElectrodeSpark Plug: Copper Centre ElectrodeSpark Plug: with gasket seatSpark Position: 1,5mmTechnical Information Number: RN2CThread Length: 19mmThread Size: M14x1.25Tightening torque from: 25NmTightening torque to: 30Nm
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Connector type: Crimped SAECountry Specific Design: JapanØ: 14mmfor OE number: N3A118110Spanner Size: 20.6Spark Plug: 1 - Earthed ElectrodeSpark Plug: Platinum mass electrodeSupplementary Article/Info 2: Only for racing purposesThread Length: 21,5mmTightening Torque: 22NmWeight: 46g