Check the ECM cooling plate, the inside material starts to break down and it lands up in the fuel filter. I've seen fine and course material in...
I've seen those tail lights on an export spec Argosy before and looks like it has 385/65R22.5 front tires. Engine valve cover looks chromed so...
If it's not fuel or fuel pump / injector related some of the Celects like CPL 1807 have this & just re-calibrating the ECM improves the hard starting.