Plastic cap. Used on Fitting Numbers 881300452A & 881310452A.The 8810241 Back Seat Fittings Replacement Cap, Black fits equipment brands such as: Allis Chalmers, Case, Case IH, Claas, David Brown, Deutz, Ford, Gleaner, International, John Deere, Massey Ferguson, Minneapolis Moline, New Holland, Oliver, Steiger, Versatile, White