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For the base gripers, I bought 9mm EPDM sponge seal from my local hardware and cut seven lengths at 120mm each and superglued them into the grooves of the underside of the wheel chock, works like a charm. If you cannot find anything similar in your country then I suggest you use silicone and slightly overfill the grooves to provide the same grip strength as the EPDM sponge seal. Photo of what I bought is in the description below. 

PRINT INSTRUCTIONS: I recommend 6 perimeters/walls and at least 25% infill. Print in PETG.

No supports are required.

Happy printing.