I couldn't tell from your picture what's going on.

But here is a photo of the seat adjusters from my '51. They're in the relative positions with the front of the truck toward the top. There's a rod between the hole in the lever on the left side connected to the slot in the latch lever on the right side. Maybe that will help.

I would think that the cable would connect the two latch levers the same way, running across the seat riser.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.