Accidently bought these for my IRS swap. They are machined for MM Coil over kit. HD series 99-04 SRA Mustangs. PN# GBE5-6418-H4. 175#-250# springs. Looking for 99-04 IRS Bilstein's in exchange. Willing to sell for $150 shipped to 48 states. PM or email me [email protected]