Feet for front and back for Remington Portable typewriter of the 1920ies, with the angled backplate. The rear feet have a extra space to also clamp the angle-plate at the back. The front feet are taller to compensate for the thickness of the plate.
Print in Ninjaflex (polyurethane). The diameter of the upper flange should be 15.5mm, then the feet snap right in.