Volvo 1800 brake parts 

Flat key rear axle hub Volvo PV/Duett/Amazon/1800 View larger

Flat key rear axle hub Volvo PV/Duett/Amazon/1800

160553

New

$8.85

+ -

More info

Not for the later version PV444
Identified by the 2.85 mm deep pin track 
And the pin is 6 mm high.
Pin 160553 to be used.