Couldn't find this pattern in the Color and trim catalog on Hamtramck historical, so maybe already a replacement or some mid year addition. You might want to explore it some more to find some info.
I used to hint at the Oldcarmanualproject Website, but Hamtramck is for now the best source for Mopar related data.
I once had a Newport with the plaid seats. They had a split right where the vinyl met the cloth. I had an upholstery shop replace the vinyl with a slightly wider section. No one could ever tell.