Replacing vertical guides on side of trailer
 

So, moving on with our 1963 rebuild we have realized we are missing 2 of the vertical metal guide rails. A previous owner has removed them at some point. Any ideas on where to go for something similar? I am pretty sure Midget and J&R will only have the newer type guides. Ours look like giant metal drawer guides. I will try to get a picture up shortly.

I ended up using a heavy duty drawer glide for $3 from Home Depot. Do you mean the rail mounted to the side or the little dovetail piece that attaches to the top and glides along the rail? We just needed 2 of the the little plastic pieces. Seems the drawer rails that go with the guides we bought could be used if you bought both things matching.
This is what we bought
Prime-Line Products Drawer Track Guide Kit-R 7152 - The Home Depot
They do also sell a kit with the track and the guide but you would need to peice together a few.
Prime-Line 22-1/2 in. Rolled-Edge Drawer Track Kit-R 7125 - The Home Depot
The orange one we bought doesn't seem as heavy duty as the original but is holding up well, doing it's job with no binding and was able to be installed without removing the top to get to it.

Our vintage model had a slightly different system than yours. The one side is the same as the kit you linked to. The other side is a full length metal piece that fits inside the rail .... they didn't use the guide block type. I will post a pic in a bit.
I am thinking we may have to switch over to the newer type system.

Updated with photos