So the car we finally ended up buying (2010 G37 Coupe) comes without the OEM spoiler, but I'd like the dealer to install one. Would they be able to move the brake light, or will my 3rd brake light become useless?

 

You can either keep the 3rd brake light, disconnect the light, or get a whole new rear deck w/o the light. I believe a new deck goes for around $150-$200.

 

just disconnect it.. most tint their windows.. with 35% or darker ud never see it.. not worth the $150+ on the part.

 

But there's a light in the spoiler they hook up, right?

 

^^Correct. I just disconnected my rear deck light and hooked up the spoiler brake light.

 

if you can live with this...

 

I had this problem too. I had both lights connected for a few weeks, but then decided to disconnect it.

I agree, if you disconnect and tint, no one can see it anyway.

I went a step further and just eventually bought the rear shelf without the brake light. depends what you want to live with and what you want to pay.