Hello:
I have made tail lights for 757-200, the lower one is a nav light and the upper is the strobe. I am going to just paste what I have.  If you do not have the shockwave lights or the effects that I have then you will have USE ANOTHER strobe and nav  effect that is located in the effects folder of FS.  Replace the name only not the cordinates.

I still cannot figure out what effect that CS are using for the wing strobes.  Maybe it is some default value.

Anyway, here are the settings that I have made for the tail lights:

light.1 = 2, -80.00, 0.30, 7.00, fx_strobe
light.18 = 2, -80.00, 0.30, 5.50, fx_shockwave_navwhi

I also added these following lights which are strobes.  However, they are not the strobes that you would see on the winglets.

light.13= 2, -17.00, -62.00, 2.50, fx_shockwave_strobe_2_nl
light.14= 2, -17.00, 62.00, 2.50, fx_shockwave_strobe_2_nl