'64-'65 Valiant/Barracuda Bucket Seat Track Springs?

I'm restoring the front buckets from my '65 (12-4-64 build date) right now. They each have two track springs (the long ones) and two release springs. Post #4 above, from a '64 Barracuda, shows one track spring in the picture. Since there is a provision in each seat for two track springs, I plan on replacing two track springs in each seat. It seems to me two would be better as the pull pressure would be the same side to side. Does anyone have a source for these springs?

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