I went with the Light Parchment. 17033 from good old Amazon for my 1999 Town Car. Tried a test patch and it was spot-on. Did three coats on the damaged parts of the seats, blended off to areas where no help was needed just so the patina would show no abrupt change, and it looks just like new. After two days of drying (and outgassing - smell was overwhelming at first), I polished the whole seat, especially the spot repairs, and you cannot tell where I did the repair.
Thanks for the tip! I recommend this product!