Drain/fill plugs for rav4 mk4 2013 awd

[Akymark]

Hi

im sure this has been answered before but I’ll ask anyway. 
im after changing my fluids in both my rear diff and my transfer box and am led to believe I need to replace the drain and fill plugs and also the crush rings. Can anyone advise part numbers and best place to purchase.

I’ve contacted my local dealers but the pictures of the parts they sent ( exploded view) were quite poor and hard to discern.

apologies again if this has been covered