1994 Jaguar XJ6 replacement wheel

I recently had a cracked a wheel. The spare tire also had a matching wheel, so I simply mounted the spare wheel on the auto in place of the cracked wheel. I now need to find a wheel to re-mount and carry as a spare. I am not concerned about a matching wheel. I am simply trying to find a basic, relatively inexpensive wheel to use. However, I am not sure where to find one or if there is a special bolt pattern or depth I need to be looking for.