Billet Specialties exclusive design features integrated adjusters, no cross bars. Fits Sanden 508 series compressor and standard size GM alternator. Fits cylinder heads with bolt holes in the ends, one hole may need to be drilled and tapped for installation. Brackets are machined from 6061-T6 billet aluminum, and polished to a mirror finish. Available for short or long pump applications. Not for use with GM compressors, superchargers, TPI, 3 deuce set-up, or Vortec heads.