Help with Lady Datejust sizes please

[bertberr]

Hi everybody, looking to get my wife a Datejust, probably a used one as can't really stretch to a new one at an AD.

She currently has a Tudor Princess Oysterdate, which is really tiny, so I was thinking either 26 or 28mm, with 31mm as a remote possibility.

My issue is, I can't find any info on lug to lug sizes anywhere, not even on the spec sheets on Rolex own site. So... anybody with access to a 26/28/31 DJ, please can you measure the lug tip to lug tip please. My wife has fairly small wrists, and they aren't flat old worktops like mine, so anything much over 38-40mm lug to lug is going to be too big.

Thanks