Oregon 78-048 Idler Pulley Replacement for Murray 095068MA For primary deck drive belt on 52100, 52101, 521613, 52161, 52370, 52431, 52461, 52607 lawn and garden tractors OD: 6", Flat OD: 5-1/8", Flat width: 1-1/8", Overall width: 1-7/16", Bore: 3/8", Offset: None Oregon Part 78-048