There may be three of them. You will find them at the top of the three stand legs, two for the center stand and one for the side stand.
The center stand fittings are on the top of each leg into the pivot. With the stand down they will be facing the rear of the bike.
On the side stand, it will be at the top just below the pivot. Depending on the year there may not be one there.
Depending on how dirty things are down there, they may require removing some dirty grease to see them. Even though I keep my bike pretty clean mine were a bit hard to find.