What options do you have for UV Set on the surfaces tab?

The Lana texture that comes with G1 is in fact a V4 map. The V5 Bree texture for G1 is a V5 map, while the Bree for G2 is a G2 Base map. G2F Base maps are not compatible with G1 Base Female Maps and vice-versa.

The texture files don't change the UV mapping automatically, or maybe they set it wrong. Have you tried manually setting the UV Set?

M5 definately won't fit.