Feet for Plastic Shelving Unit (PL4 Greenbank.)

I bought a set of Plastic shelving units like the type shown in the provided image but I need four additional feet to use them the way I'd like to have them set up.

The dimensions of the feet I need are:
Height 9cm
Thickness/circumference 3.4cm

I'm not sure about compatibly between products as the design of the feet on some other brands of shelves look different.

If anyone has got any they no longer need which look the same or something to the ones I've got message me.

I'm in the PL4 Greenbank area and can travel a certain distance to collect if needed.

Thanks.