Like zoot said mine too on my 51 are on the passenger side
against the firewall

 

I got it off a local classifieds website. I think he just put a service deck / tool storage on it is why he took it off. He also had these taillights off it for sale for $10 which I also grabbed.

I think they will look pretty good, uses bright 3157 bulbs and has a slick plug in harness connection.