Seriously bummed;New brakes don't work

[WorkinLonghorn]

I've been sucessfully doing my own brake jobs on my fleet of junk since I was a kid.
On my '69 GMC with Dana 60 rear I started getting stuck right rear brakes. I looked and both sides were soaked in fluid/oil. The drums were pretty shot too so I got new wheel cylinders,new drums,new oil seal (left side),new hardware kits,new shoes.
Put everything on and test drove it and the right rear locks up WAY too soon! Plus it drags even with the adjuster backed off. Drum turned blue from the heat. Took it off and found the seal leaking so replaced it and the oily shoes and scrubbed the blue drum with sandpaper. Still locks up REAL easy and still drags.Oil still leaking past the seal and today I noticed the fluid was way down in the MC.
This really sucks bad. I do have a simple question though.

Is it possible that the two top springs interchangeable or does one color go in front and the other in back? That's the only thing I can think of unless there is a 3/4 ton kit and a 1/2 ton kit and they sold me the wrong ones.Or the cylinder is a larger diameter (for the fronts???).

As for the seals still leaking,the seal surface looks good.Maybe the wrong seal?
I'm too bummed to even lookat the right side. Here's what I found after first set of shoes without replacing the seal;