Aftermarket Replacement for Partner Part Numbers: 531 20 78-48,  531-207848,  5312078-48,  531207848,  5818431-01/8, 581 84 31-01, 581-843101, 581843101, 5818431-01, 

For Partner Lawn Mowers: 

3750SD BIO, P3750 SD BIO, 983878134, 2003, 

5551CDX, P5551 CDX, 953878094, 2005-01, Lawn Mower,

6053CD, P6053 CD, 953878108, 2002-01, Lawn Mower,

6053CDTX, P6053 CDTX, 953878128, 2003,  

1 x Brand New Best Quality Aftermarket Replacement Blade Boss Holder Hub, 

This is the part which fits over the engine crankshaft to enable the blade to be attached. 

This type also has the integrated pulley in the top for the self propelled system drive belt to run off. 

FREE DELIVERY WITHIN THE UK !