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Chris,
Judging from your earlier photos the seat back was replaced, likely when the bottom cushions were replaced. It appears to be about 2" too high, which is consistent with your comparison with the springs from Snyder's. You can see part of one of the three upper seat back retaining brackets in the photo below. There's three different brackets that catch the bottom edge of the spring that attach to the three wood uprights behind the springs. I'll take a photo of both brackets later today; they are easy to make if missing.
I've added another photo showing one of the original lower seat back retaining bracket in place.