Volvo Type Stern Seal - 1.25" Shaft & 52mm Stern Tube With Water Feed Key Material has developed the shaft does

has developed the shaft does not actually come into contact with the bearing

Fuel filter O ring

3 1/2" outside diameter

but MUST  be held in place with a grub screw or alternative method

The zinc ring has been tested and specially produced for Volvo Penta drives and propellers and is also ideal for salt water use

Volvo Type Stern Seal - 1.25" Shaft & 52mm Stern Tube With Water Feed Key Material has developed the shaft doesVolvo Type Stern Seal 1. 25" Shaft & 52mm Stern Tube Volvo Type Stern Seal 1. 25" Shaft & 52mm Stern Tube Volvo Type Marine flexible stuffing box designed to replace Volvo part number 3819725. Tube diameter tolerance +0. 5, 0. 3mm. The distance between bearing points must not exceed 1500mm (59").