200tdi gearbox drain seal

Don't know if this is the right section. I need to change the gearbox, transfer box, and diff oils. Both the drain plugs on the gearbox and the transfer are leaking so i need to get new washers for the plugs. Have been looking for them on various sites but can't seem to find them. Would anyone be able to point me in the right direction as to where i can find them, or what the correct name for them is?

Cheers All

gearbox ftc4112 t/box frc4808

Local motor factors?

Many thanks for quick reply. Didn't realize the transfer box one was just a copper washer.

Cheers