Changing 3rd light in tail to stop/turn signal

[Hybridbird]

I was looking to make my 3rd (inboard) light in my tails into a tail/stop/turn like the other two,for some reason when I see it there not blinking with the rest it just doesn't look right.Has anyone done this,or know where there is a write up on it?I know I will have to get a couple of socket/pigtails from a donor car,but will they mount in the existing holes or does the housing itself need to be modified?Any leads/suggestions/link would be appreciated,thanx for thanx for the read fella! :banana:

 

[Wes8398]

I totally agree that it looks funny with the one light not blinking or lighting up with the brakes. I'd like to do the same mod that you're speaking of.