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I need a replacement air filter for my OPS .21 in an RC500. An OE replacement would be wonderful but I would be happy to have one that works well and protects the engine. I want to run this car and only have the one original air filter shown. I don't know how similar the carbs are across brands. I'll keep my original safe so if this car gets shelved I have it to display. Thanks in advance for your time.
Dave

Do you have a way of measuring the dimensions accurately? I would think just about any filter that will fit in there would be fine unless maybe I'm missing something... which is often the case.

the sticker-ops is atleast in nice shape, my sticker pn my ops filter is gone.