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Denso 5021 Spark PlugOE Quality 60-Day Returns
Part #: 5021

Denso 5021 Spark Plug

U-Groove Conventional
⚙️ 46 vehicles fit this part
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Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
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✅OE Direct Replacement — Bolt-on fit, no modifications needed
📦U-Groove Conventional
🚗Fitment: Buick, Oldsmobile, and Pontiac, Bonneville, Catalina, Century, Custom Cruiser, Cutlass, Cutlass Supreme, Delta 88, Firebird, Grand Am, Grand LeMans, Grand Prix, LeMans, LeSabre, Omega, Phoenix, Regal, Skyhawk, Skylark, Starfire, and Sunbird
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Denso 5021 Spark Plug
BrandDenso
Part Number5021
PositionU-Groove Conventional
Resistance5000
Ground Electrode Tip DesignU-groove
Ground ConfigurationStandard
Ground Electrode Core MaterialNickel
Center Electrode Core MaterialCopper
Center Electrode Tip MaterialNickel
Pre-Gap Size1.5
Ground Electrode Quantity1
Hex Size16.0
Manufacturer Heat Range14
Seat TypeTapered
Reach11.60
Thread Diameter14.00

This part fits 46 vehicles. Search below:

YearMakeModelPositionNotes
1979BuickLeSabreN/AU-Groove Conventional
1979OldsmobileDelta 88N/AU-Groove Conventional
1978BuickCenturyN/AU-Groove Conventional
1978BuickLeSabreN/AU-Groove Conventional
1978BuickRegalN/AU-Groove Conventional
1978BuickSkyhawkN/AU-Groove Conventional
1978BuickSkylarkN/AU-Groove Conventional
1978PontiacCatalinaN/AU-Groove Conventional
1978PontiacFirebirdN/AU-Groove Conventional
1978PontiacGrand LeMansN/AU-Groove Conventional
1978PontiacGrand PrixN/AU-Groove Conventional
1978PontiacLeMansN/AU-Groove Conventional
1978PontiacPhoenixN/AU-Groove Conventional
1978PontiacSunbirdN/AU-Groove Conventional
1977BuickLeSabreN/AU-Groove Conventional
1977BuickRegalN/AU-Groove Conventional
1977BuickSkyhawkN/AU-Groove Conventional
1977BuickSkylarkN/AU-Groove Conventional
1977OldsmobileCutlassN/AU-Groove Conventional
1977OldsmobileCutlass SupremeN/AU-Groove Conventional
1977OldsmobileDelta 88N/AU-Groove Conventional
1977OldsmobileOmegaN/AU-Groove Conventional
1977OldsmobileStarfireN/AU-Groove Conventional
1977PontiacBonnevilleN/AU-Groove Conventional
1977PontiacCatalinaN/AU-Groove Conventional
1977PontiacFirebirdN/AU-Groove Conventional
1977PontiacGrand LeMansN/AU-Groove Conventional
1977PontiacGrand PrixN/AU-Groove Conventional
1977PontiacLeMansN/AU-Groove Conventional
1977PontiacPhoenixN/AU-Groove Conventional
1977PontiacSunbirdN/AU-Groove Conventional
1976PontiacBonnevilleN/AU-Groove Conventional
1976PontiacCatalinaN/AU-Groove Conventional
1976PontiacFirebirdN/AU-Groove Conventional
1976PontiacGrand LeMansN/AU-Groove Conventional
1976PontiacGrand PrixN/AU-Groove Conventional
1976PontiacLeMansN/AU-Groove Conventional
1976PontiacSunbirdN/AU-Groove Conventional
1975OldsmobileCustom CruiserN/AU-Groove Conventional
1975OldsmobileDelta 88N/AU-Groove Conventional
1975PontiacBonnevilleN/AU-Groove Conventional
1975PontiacCatalinaN/AU-Groove Conventional
1975PontiacFirebirdN/AU-Groove Conventional
1975PontiacGrand AmN/AU-Groove Conventional
1975PontiacGrand LeMansN/AU-Groove Conventional
1975PontiacGrand PrixN/AU-Groove Conventional

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

T14PR-U15

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

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