Dan,
There is not a pattern that I am aware of but maybe this will help from a past post fron A NORTHEN FRIEND:
"Hello Peter,
I'll try this again, last time my message was lost. 1st of all I hope that you have
the light assemblies or are planning on ordering them before you start this work.
It will make life easier. My lights are installed already and I don't feel like pulling them out. Outside dimensions of the chrome trim is 5" long x 2-3/8" tall. From the nearest edge of the licence plate hole to the ouside of the closest edge of the
chrome trim is 14-3/4". Above the light there is a crease in the panel. The top of
the chrome is 1" down from this. I took the following measurements on the
backside of the panel. The light is mounted through a circular cutout in the panel
- this has a 2" diameter. The two studs that hold the light in place are 2.5"
center to center. The hole on the backside is 1-5/8" from the inside of the frame.
If you take a solid ruler and measure from the bottom of the hole to the tab that
sticks out of the bottom of the panel that measurement is 3-1/4". Hope this
helps. Ask if u need more"
This POST was found by doing a SEARCH on RS backup lights on the FIRST page of Camaros.NET. This will search ALL forums at the same time.
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[This message has been edited by sr71bb (edited 08-26-2000).]