Compatible with Porsche Steering Rack Mounting Bushing PAIR,,, these 90 durometer bushings will greatly improve steering response . poly bushings out last stock rubber bushings 4 to 1 and are unaffected by gas, oil and ozone 924S/944 with power steering, 944S, 944S2, 944 Turbo, 968, 924S (1987-1988) , 944S2 (1985-1988) cross reference Part #944-347-137-00 and 944-347-139-01 Made in the USA by Ricochet Polyurethane Technologies. Our polyurethane compound goes through a special process to blend ultra fine Para-Aramid fibers into our precision cast bushings, the same fibers used in bullet proof vests. Like rebar in concrete this creates a part with unsurpassed tensile strength and abrasion resistance while maintaining the flex and rebound properties of the polyurethane.