It came to my surprise that Lexus doesn't list the RC on their accessories portal (Lexus Accessories and F Performance Parts). Not sure if you just want something basic or have very specific things you're looking for like specific types of material, type of fitment, etc.
Through previous experience I have come across a number of aftermarket companies that provide great car covers, something which a simple google search should bring up.
If there's a real sense of urgency then you might want to go universal for now, plus universal covers are usually cheap. Cheap protection for the exterior or interior sure sounds good to me!
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