It looks like there is a similar one on ebay:
http://www.ebay.com/itm/1964-65-Pont...a3801f&vxp=mtr
It's box says part# is 984776 and the ad says it fits 64-65 GTO & Lemans
But if you plug that number into PY's Parts Lookup database, it says 1967. Does that sound right?
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