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12mm bolt kit fits RLCA mounting and IRS swap, 1979-1998



These 12mm bolts have 2 applications:
  • Solid axle: attaches 1979-1998 rear lower control arms to a 1979-1998 Mustang chassis and to a 1979-1998 rear axle housing. Two kits required per car.
  • Cobra IRS swap: attaches the 2 forward IRS subframe mounts to a 1979-1998 chassis. 1 kit required per car.

MM sources this hardware from Ford. Nothing beats the OEM hardware for functional, correct-fitting design and excellent anti-corrosion coating.

  • 2 kits required for 1 solid axle-equipped 1979-98 Mustang, to attach each end of both rear lower control arms.
  • 1 kit required for 1 IRS-equipped 1979-98 Mustang, for the forward subframe-to-chassis attachment.
  • Not for 1999-2004 chassis. Use MMF-4 for those 14mm applications.


  • Proper OEM size: metric, not a "pretty-close" English size like others sell. Use metric tools for installation.
  • OEM hardware
  • OEM anti-corrosion coating
  • OEM flange-headed bolts and nuts designed specifically for this application.


  • 2 flange-headed bolts, 12mm
  • 2 flange-headed nuts, 12mm
  • OEM-level anti-corrosion coating


  • 1979-1998 Mustang with solid rear axle
  • 1979-1998 Mustang with a swap to a 1999-2004 Cobra IRS

Does NOT fit 1999-2004 Mustang.

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