Not that I'm wishing anything on you , but I think that you're going to have a hell of a time finding green-specklled rubber flooring .
Most cars came with plain black mats , but I have seen tan , green , blue and black ; and obviously the black-with-blue-specklles one I found for my '73 Duster (albeit , almost 20 years ago ! ).
I think that if there was enough demand , that the o.e.m.-style rubber floor covering could be reproduced .
I'm just gonna get the black ones from Year One for my '72 Coronet .