Saint AAI

Does anyone know the size of the crush washers on the sump and gearbox drain plugs? Also does the drain and refill plugs on the rear diff require them and what is the size if they do? Car is an MY99 GC8, but I have Type R drivetrain. Gearbox is still a 754 and rear diff is an R180 if that makes any difference to the size of the plugs. I'm changing all the oils shortly so want to stock up on the correct size washers.

Thanks in advance, Shane.