Yes, that is the correct caliper for a 2000 900ie.
It's a BR 20.5161.43. I had a 900ie and S2R 1000 and I fitted a BR.5161.42 to the S2R. The BR 20.5161.43 is a replacement for the BR 20.5161.42 and, since the 900 and S2R calipers were interchangeable, the BR 20.5161.43 will be fine for your bike. (The mounting hole centres should be 84mm apart.)
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