Offfff that's not easy to get into! Think I'll maybe give it a miss.What spec is the first van and what spec is the second pic, that way you can suss out the accessories.
I think you already have one of those plates and wires on the positive zesty , do you think it could go on under the other plate hence having no previous bolt markings , as another reply you had earlier pointed out that red does not normaly go to negative