That's a good point. Actually, I saw one on Ebay a while back that apparently lock. I don't know what mechanism is used for this, but maybe that could be a better option. But seeing that you've purchased them already, another idea could be to have them on while you're driving and when you park your car, switch back to the 'ol black plastic ones (although that may defeat the purpose of having them anyway, but it might be a better solution then to have them stolen from you)....unless of course, you don't care.
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