those look like Michelin C5 rally snows. A beat up Saab 99 equipped with studless versions of same annihilated the field at a muddy rallyx here in Maine. Beat a batch of well-driven Rexes, RSs, Evos, G2 Golfs, and ancient RWD Volvo, everything. And not by a little, either. His grip was SO much greater than anybody else. That thing tore thru the mucky infield at a horse track like a beserk Swedish weed whacker.
Subaru specific rims for these tires are simple to find--16" steelies from WRX/Legacy space-saver spares. C5 tires not so easy to find -- Libra Racing in VT, Four Star in Canada, or maybe Sube Sports in CA. Be prepared to shell out beaucoup $$.
Exotic Tire Addict