For OEM replacement I would go Bilstein. Arnott is fine but keep the receipts for their warranty. They are well established for air shock replacements for airmatic cars. Their quality (like many) seems to have slipped a bit on the air parts but a standard McStrut is kind of hard to screw up.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth