I just did this mod!!!
While doing some rust repair i noticed that both bumper mounts were broken. I got a new bumper from
Chiwanga. I figured while the bumper was off i might as well fix dem' Lights.
Before:
After:
I bought the lights for pep boys. they fit perfect and used all the original mounting holes.
mounted the bracket using existing hole.
mounted light to bracket. feed wires through existing hole. If you look closely the light is not centered in the bracket. It is off set. this allows the light to fit nicely while still using the stock grommet.

To get the right bolt threaded i had to pull the rubber grommet out of place and insert a screw driver from the inside of the bumper.
i mounted a relay behind the passenger side light.
Then i ran a constant power from the battery, through the firewall, under the carpet and out the back of the wagon. The lights came with a fuse so i used it up near the battery.
then i wired everything up. the picture is not that great sorry. essentially, the reverse stock light switch powers the relay and the constant powers the lights through the relay. the relay and both lights are grounded to the stock grounds. the left stock backup light power is capped. this way the lights are still triggered by the shifter but will not over load the stock switch.
the only thing left to do is re attach the bumper. (dont forget the washers)
when i was doing this i acidentally pushed the two outer bumper bolts into the body. if the happens you will need to remove the right deck panel and reach through a little hole to reset the bolts. in the picture the hole is where the green wire is fed through. (i left the extra wire so i can re route it in the future)
And with everything back together...


i tried the make sure that everything is reversible. (except a few end connectors).
I still need to go through and replace a lot of the electrical tape with insulated connectors.
sorry that the pics are crooked and huge. this is my first write up.
let me know if you have any questions.
I will probably post some night time pics soon.
P.S. I know the paint looks terrible, shes a work in progress.