The one pictured takes the small bearing hubs and stub axle (stock Europa). They are geometrically (suspension) the same as the Herald type, and from what I've been lead to believe they are stronger than the Herald/Europa/Elan type. Unless you're wanting a 100% correct car, there is no reason why you couldn't fit them.
The GT6 uprights have a larger stub axle to accept larger bearings, but I can't remember if the stub axle dimension is the same where it goes into the upright. The GT6 caliper mounts are different as they take a 16P or 16PB caliper.