Easiest way to get the right paints is, as was said, go to your local hobby shop and pick them off a shelf. Buying paint online is a bleepin' bad time if you're looking for particular hues. Judging greys in particular is really hard from a photo. Save yourself some heartache and get eyes on the actual containers.
Warm greys like you've got there are very good at coverage and should be available in virtually any brand.
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