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Good Morning, Fellas!
Say, what was/is the purpose/reason for the little 'fin' located on the back side of some of these Jr West Coast style mirrors?
Here are some mirrors with the 'fin' on the backside (as an example): http://www.ebay.com/itm/1975-UP-FORD-ECONOLINE-JR-WEST-COAST-MIRRORS-NOS/301485843260?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D28794%26meid%3Dc9f9654ac3824c9d97c0090cf3539b64%26pid%3D100005%26rk%3D3%26rkt%3D6%26sd%3D201278225085&rt=nc
BarnieTrk