On eBay.
Cougar Headlight (http://"http://cgi.ebay.com/ebaymotors/1987-1988-Mercury-Cougar-right-headlight_W0QQitemZ220580899472QQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item335ba56a90")
Some NOS inner parking lamps, also for a Cougar:
Right Parking Light (http://"http://cgi.ebay.com/ebaymotors/1987-88-Cougar-OEM-LAMP-Turn-PARK-E7WY-13200-B-RH-Light_W0QQitemZ110505942518QQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item19baaaddf6")
Left Parking Light (http://"http://cgi.ebay.com/ebaymotors/87-1987-88-Cougar-Front-lamps-Park-side-marker-light-LH_W0QQitemZ110505789030QQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item19baa88666")
I bought a set of the park lights a few months ago,...... they were beautiful.