The 5de seems to be a little inactive (though they are undoublty still around, I've seen a few of them at battles), so yeah, 2e Bataljon van linie (Grenadier compagnie) or 3eme Grenadiers.
Personally I'm looking into the 6de Huzaren van Boreel. It's expensive, but I just sollicated for a job that might make it possible.