I'm confused. You say you want to put magnum 500's on. You found two 14x7 WITH hubcaps!! Are you talking about the wheels already on your car? I presume you are but.......... Magnums do not have hub caps of course, just center caps.
While on the subject of Magnums, I bought 14x7's and 14x8's (rear) from Summit which are Wheel Vintiques brand. There are other aftermarket 500's out there, but I have found these pretty good. 500's are "lug centric", which means they must be balanced on a machine with the appropriate adaptor. Also, NEVER use an impact wrench to tighten the lug nuts, hand only with a torque wrench. The set that were on my car when I bought it, had egg shaped holes from incorrect installation and they could not be properly balanced. Out of the 4, only one was suitable to be kept for a spare with a now 15 year old tire on it.
I do have an original never-been-on-the-road wheel and bias-ply tire that was in the trunk of the car when bought. Funny thing is, I have no pictures of it. That tire will be 53 years old shortly.