Canon Lens Dust Cap E (Rear)

I have used the Canon rear lens cap for both EF and EF-S lenses.

The Canon rear lens dust cap will fit any EF/EF-S lens, which includes the lenses that would typically mount onto your Canon EOS 90D.

I would think so. The B&H photo page for it says it fits everything Canon

That looks more like a body cap to me, not a lens cap.

TAIWAN, but this is subject to change.

Yes, the Canon Lens Dust Cap E (Rear) will fit the Canon EF 600mm f/4L IS III USM Lens.

Yes, our offering on this link is for an original/genuine Canon Lens Dust Cap E (rear) for Canon EOS EF lenses.

Yes it does fit that lens.