You probably want milsurp FAL mags - metric, not inch (Keltec RFB and Rock River LAR-8 use metric FAL mags). There are plastic ones available, and new manufacture DSA but they have issues in FALs - not sure on the RFB and LAR8
FN is somewhate generic - make sure they are for a FN-FAL
Stripper clips are out there (some Aussie ammo came packed on it) but they are standard 762x51 strippers. And, there is a stripper charger available as well - $5 or so.
You probably have your answers by now, but fwiw, look at the marketplace on the fal files for surplus steel mags if you want metric fal mags. You may also find Belgium alum ones. That's assuming your .308 is one such as a rock river. They use metric. Moses mags are great too.