635384R2 International 500 steel steering clutch disc. These aftermarket steel steering clutch discs for the IH 500 series tractors are of the highest quality on the market today. The IH 500, 500G & 500D tractors require 6 of these steel discs per side. The 635384R2 steel steering clutch disc measures 9″ in diameter. These discs are for the 500 series only and will NOT fit the IH 500C or 500E tractors. The later International 500C & E tractors use the 10″ discs, part #676833R1.