Anyone got some extras or know where I can get them? I was looking on AcuraPartsWarehouse but they’re all on back order. Thanks in advance! Specifically, numbers 19 and 20.

 

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Not sure what to say, when I google search those specific part numbers there are many Acura / Honda online vendors that reflect 'In Stock'.
I would just put the work in and proceed down the search list, vendor by vendor, giving each a call, maybe you'll get lucky.