[rawy]

Thanks Jeff & Jim I'll search the indicated paths

What I know on battleship linoleum and what I found

The Original stuff is brown ribbed 4mm, 5/32" thick

The closest replacement I found is produced by Armstrong, they carry two varieties in 3,2mm, 1/8" and 2mm,5/64" without groves but one of the available colours is very close.

Also received some samples from a Oregon based company SMS Auto Fabrics, they offer a very thin linoleum looking material with two backing material options, the 1mm, 3/64" overall thickness makes it difficult to reproduce the original 2mm,5/64" deep groves.
In fact this material has a ribbed structure which would fit in size but I'm looking for a better solution to frame up my seats with less tweaks.

If there' no better solution I would go for the thicker Armstrong material, laminate a backing material to compensate the required thickness for good fit in the seat framing and find someone able to cut accurate ribs in there.