Ha, yeah, you've bought a harness for a "Formula" car, in which there's typically very little working room. Hence the short shoulder straps, and the sub straps are designed in a specific way to have no hardware between the drivers legs.
It would still be an effective harness in a saloon car if you were to figure out a way to properly mount it, but good luck with that. Your only realistic option here would be to sell that, and get one designed for your type of vehicle instead.