Since this is the Rolex area, and I'm assuming you need a Rolex datewheel, you can get the modern datewheel for Rolex from
www.cubic-works.com/
It comes in white or champagne.
For vintage Rolex, you can go to
www.eurotimez.com/ and under watches 2009- a side panel- it opens up and you're looking for mbk-rlx-1-1-dw. this is the vintage wheel for the 1500 series movements from the 60's and 70's- like the 1680 sub, 1665drsd, 1655explorerII, date and datejust. You have to email eurotimez to place your order- they're new and not in the system yet.