Oldsmobile Intrugue Wiring

I know somebody posted this before bu I have a more technical question. We are making a show car out of our Intrigue and are hooking a FS FA6 flasher to the rear lights.

When I look at the wiring directly into the rear lights, they are exactly the same left to right. This confuses me as the Left Turn and Right Turn should be different, unless they junction up earlier somewhere. The wires I have are as follows. BROWN / White, White, Black, Blue/White and Green. Would anyone know what the wiring diagram is for the rear lights for the 1999 Oldsmobile Intrigue?

Thank you,

M Jones