Replace worn or damaged Diff Case Washers on your HPI Hellfire RTR - HPIC1050 and get it ready for fun again with the stock 4 Diff Case Washers from HPI. Fiber construction Six Diff Case Washers (gaskets) Installation following the model manual Inside diameter: .79" (20mm) Outside diameter: 1.22" (31mm) Thickness: .027" (.7mm) These washers are used in the front, center and rear differentials kpm02/21/2006 ir/jxs &