-High-Quality Stainless Steel Unison Ring, Nitride hardened one available(more wear-resisting) -Suitable for: Ford Powerstroke 6.0 2003-2007 Garrett GT37VAS GT3782VA Chevy/GM Duramax 6.6 Garrett GT3788VA LLY, LBZ, And LMM (ONLY FITS SOME SUBMODELS, please contact us if have any questions)