Victor H. wrote in news8oig8lfd0dgo0goes4cm2nl91sossmgd3@
4ax.com:

I want this keyhole hanger for an oval oak mirror frame which is
1 1/2" wide. All the metal hangers that I've seen have screw holes
above and below the keyhole slot and are too long. Please send me the
link for the hangers you think I may use.

Is there some reason you can't use a keyhole router bit to make your own keyhole(s) in the
wood?