BMW Strut Insert Bilstein B4 31321135892

The BMW Strut Insert Bilstein B4 31321135892, manufactured by Bilstein B4 (part number 21-030505 / 21030505), is an OE supplier-quality replacement designed for precise fit and reliable performance. This strut insert is engineered specifically for select BMW E30 chassis models. Refer to fitment details to ensure compatibility.

Key Features:

• OE supplier product for assured performance
• Verified Bilstein B4 quality and engineering
• Manufacturer part number: 21-030505 / 21030505
• Direct fitment for specific BMW E30 models, including 318i, 318is, 325, 325e, 325es, 325i, and 325is (see above for applicable years, body types, and position)

Note: Designed only for applications that match the specified vehicle compatibility, including models requiring a 51 mm outside housing diameter where noted.