Not sure if you mean a hard plastic thingamajig, but perhaps something like these?
https://www.jpscorner.com/products/guardhouse-2x2s-ase?_pos=42&_sid=a7250f0e0&_ss=r
https://www.jpscorner.com/products/marcus-plastic-2x2s-silver-eagles?_pos=27&_sid=a7250f0e0&_ss=r
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