You didn't mention if standard mirror or racing mirror, so let's asume standard which is the same for all years.

these guys are insane being FULL new repro mirrors are on $40-60 rate LOL

http://www.bradsnosmopar.com/newreabeboou1.html

but maybe catching the PN on decal, partially hidden by the glass could be found the manufacturer website or price... which I bet are around $8-15 LOL. I got mine for racing mirror on around that maybe 8 years ago, from ebay or even Rockauto, can't recall ( searched on Rockauto and not anymore available ).