Grease/Dust caps

I have purchased 4 Dust caps on e-bay, one fits my rear axle for the 1925 S-24.
The other 3 are much smaller, they measure 2 3/4" high, 2 3/4" OD. would anyone know what IH vehicle they would fit.

I am looking for the second rear dust cap, it measures 2 3/4" high with a 3" OD.