Fitment: For Duramax one billet aluminum spacer plate, one air bleeder screw and 4 bolts(2 short bolts for 2001-2010,2 long bolts for 2011+)
Change filter easier: Use this aluminum spacer to relocate the Duramax Filter Head outboard by 1/2". This allows for much easier access to the filter for quickly and easily filter changes every time!
Material: The spacer plate and bleeder screw is made of CNC machined from solid billet 6061-T6 aluminum and anodized Gold for strength and corrosion protection. Will last a lifetime.
Bleeder screw: No more stripping of cheap plastic bleeder screw that can break with routine servicing over a vehicle lifetime.
4 Bolts: The thread length of short one is 30mm,The thread length of long one is 45mm.