Rallye Wheel Question

I am looking to replace my front wheels with a rallye style wheel from wheel vintiques since I am upgrading to the bbp front disc brakes and have spb rallyes front and rear. My question is I'm looking at the 14x6" with a backspacing of 4". Is this the wheel I want? I'm not real sure what backspacing I need and I just wanted to make sure this sounded right. Thanks!