Yes you do need a wiper if you have a front windshield ,top or no top .And yes it really does make a difference on your inspector but legally you do need a good wiper, a clip on will pass .If your Cobra is registered as a 65 why not go with antique license and no inspection sticker and only a rear plate ...
I am a State Inspector and I do not agree on lots of their rules and regulations but they can track you down by the no. on the sticker set you up and give the station a fine SO!
There are lots of things we can get ugly bought , I can always find something wrong with the wrong attitude trying to tell me it will pass just give me a sticker Be patiant ask a few ?s Feel the guy out first be nice it may be Me
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BIG T
Good Luck