Hi Gordon
Looking back through war time photos that have been posted over the years the small L shaped two light holder was pretty much standard.
Take a look at
http://www.mapleleafup.net/forums/sh...ad.php?t=14097 I'll find some other photos.
Photos below are HUP but all of original mounting brackets for the Pattern 13s I have seen have look identical. Note the switch this is a late production change replacing the tail light isolation switch which had been on the frame near the right rear wheel to a switch on the tail light. It turns off the tail light and turns on a light under the truck aimed at the differential back which was painted white. This was for blackout convoy.
As tail lights they are totally worthless. On all of my three I've added 3" commercial truck tail lights. On my large trucks I have concealed these behind the standard round reflectors which where common to military vehicles.
I've been looking for good bright LED units to replace the bulbs.
Think I have an original bracket that came with my C60S on the shelf that I can do a drawing of.
Cheers Phil