A similar rear caliper is used on the VTR1000F Firestorm (in gold, if you are that way inclined and want to swap for sake of bling!) and also on the NTV650 and Suzuki SV650. (650N model I think, not S model.) These are widely available.
Any 520 chain will do the job. No part number needed. Just make sure it has enough links! 15/42T is standard for MC21 sprockets, so you need a chain with 108 links. Buying one with 120 links will most likely cost you more, just for the pleasure of throwing away what you shorten it by! May as well roll up a £5 note and set fire to it at the same time... unless you smoke, and then you are already doing that!

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Andy.
NSR-WORLD.COM
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