There is no old bushing. The carb body wears out after years of use around the throttle shaft causing it to wobble and become loose and normally making the engine surge or not run smooth. These fit right into the body with no modifications. 
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DWayne
1973: 128, ag tires, 3pt. lift, spring assist, lights, 42" Deck
10" moldboard plow
2016 XT1 42" deck 18HP
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