1951-64 DIFFERENTIAL SIDE GEAR BEARING SHIM 0.100" THICK. NOTE: FOR 1957 RAMBLER V8 MODELS AND FOR 1958 RAMBLER REBEL MODELS WITH AUTOMATIC TRANSMISSION THIS IS USED WHERE THE DIFFERENTIAL INSPECTION COVER IS HALF ROUND IN SHAPE AND USES A 3/4" X 16 HEX HEAD FILLER PLUG WITH GASKET PLUS ALL MANUAL TRANSMISSION MODELS; FOR 1963-64 CLASSIC MODELS THIS IS USED WITH THE OPTIONAL V8.