Amazon has some larger size mats or runners made of the thin indoor/outdoor carpeting similar to what JW used. The photos seem to show a subtle ribbed texture and colors are in some tan and brown shades which might be close to original. The link is one of the shades but there are several others.
If Amazon can carry it I would expect local stores would have something too but their color selection might be limited. It may not be exactly as an original Packard mat but it would appear many do not have or know what those looked like anyway.
IMO, the thin indoor/outdoor carpet might be more appropriate than using fiberboard with a covering. With your not flocking the trunk sides and your blue color the mat might look better with a blue or gray shade.
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