Help!!!!! How To Separate Buckets Seat Tracks

My 69 cuda tracks are metal rollers and cage. I wound up drilling one rivet out on the end. But just the back of the rivet so when I was done I just hammered the rivet back in and dropped a weld on the back side of the rivet! I have a track here ill see if its close to what you have > I don't need it it looks like a bench seat track? Here is a picture of the revit I re-wielded back in on the right. The one on the left is what It looked like before I drilled the back off!. You only need to remove one . IT was a PITA to put back together. I recommend taking pictures before you take it apart. And the cage has to go back in the same way it came out. So do only one track at a time to look back.