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There might be some surface rust
939 CUP dimension (standard-diameter of bearing cup / diameter of seat where cup sits)
Upper Gearcase Water Pump Housing
GM 140hp 4cyl 3
Stamped Part Numbers: 550570
Mercury Kiekhaefer Outboard 20864 Adaptor Ring Ball Bearing Mark 55 55E Intermediate Housing There might be some surfaceItem Description Mercury Part Number 20864 Ring, Adapter Ball Bearing, Generally a part of 20862A1 Bearing Carrier Assembly used on Mark 55 55E 58E 55AM 55AE 58AM 58AE and some early 300 350 400 40hp 450 45hp 500 50hp (please check your parts breakdown) This unit measures 3. 045" in total diameter (measured with a caliper) Purchase with confidence! General Disclaimer (please read) These are New Old Stock Parts from a large mercury Mark & K models
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