Taillight cavities on a fleetside bed.

[Snarf]

So I am chasing a taillight electrical load issue on my '69 c10 and opened up a can of worms to say the least. Looks to have been a problem for awhile because someone already made a "fix" of sorts on the passenger side. Does anyone have a good picture of the inside cavity of the inside of a non rotted taillight cavity? I would like a visual template to work off of to make the repair. Thank you for any help...