Need info on 72 A body bucket seats

Alaskan_TA said

On a 1972 seat, depending on timing, only one visible spring at the top or later on, no visible springs at all, all you see is foam.

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I saw a long thin metal piece running from side to side embedded in the foam..It would be positioned around where the middle to upper part of your back would rest against the seat back...I'm quite ignorant on a lot of the smaller details of seats and changes that were made from year to year..I can identify some seats by looking at them but thats about where my knowledge is limited to on them..Trying to learn a bit more by asking questions....