1967 camaro rs rally sport original headlamp relay & panel
 

What exactly is this, and where is it located on the car?

I'll have to check Danny's Camaro to see if we have this duhickey....

Rally Sport Head lamp door relay board.
Is there an "858" stamped into the bracket?

Yes rally sport relays for headlights. Marlin my wife has a 67 RS. If you need to look where its mounted I am close to you. Joe B.

under left fender. If you need any parts - I have an original. I just put a new one in during my resto - all that you can see is the mounting screws after it's installed.

Relays are mounted tucked under left fender close to rad support and washer bottle. There should be two holes for mounting relay bracket. See attached pics.

A little off topic and apologies for hijack, but I have the original switches (buttons) that mount on the core support for the open position. I have the brackets and hardware too if someone needs them. PM me thnx.

Interesting, I'll have to check Danny's car - but it has NOS fenders on it so I doubt that duhickey made the transition....