So I'm doing another s900 install today and I noticed that DJI has added some new parts/pieces to the s900 and I cant find any info anywhere as to where these go. Can some please point me in the right direction?

How about the bag of small grommets, what are those for?

Yes. Those are the landing gear leg rings. They should be on the landing gear legs about 30 mm above the skid tube. they act like bumpers when the gear is retracted. You only need 2. 2 are spares.