1963 Plymouth Valiant Convertible Signet 200

if it is the one under the dash and looks like the one in pic#1 then It's domed . I had to make some copies for my 2 64 and 66 darts after I found one in decent shape but hazed too bad to use. I made mine clear though not frosted or that milky white. so 64 and 66convertibles had this type, I'm not sure about 63 or 65 since I haven't looked at any for that particular part .
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