Ok I did a search and couldn't find anything.
But I measured my original stock 1997 front springs as 16 inches long. I know they are probably sagging some.
I also found a replacement set of OEM springs on eBay and the auction says that the 97 Jeep Wrangler front springs only measured 16 inches long while the 1998 - 2006 measured 17 inches long.
Does anyone know if the 97 TJs had shorter front springs?