This Trailer Buddy Bearing Grease Protector by UFP is designed for use with Trailer Buddy Rubber Spring and Torsion Axles. The UFP Trailer Buddy Stainless Steel Bearing Protector will accept the Stainless Steel Cover Cap Part Number #07509 PLEASE NOTE: This Trailer Buddy Bearing Protector cap is not the same as the standard buddy bearing protector, as it accepts the stainless push in center cap and WILL NOT fit the standard Bearing Buddy rubber bras.