I did this just three months ago... it is easy, but prepare to do a little work.

First, make sure that the Taurus wheel you're getting is the correct bolt pattern (I'm not sure, but I've read that some models, maybe SHO or LX, have differences). The correct bolt pattern is 5 on 108mm (4 1/4"). I took the donut spare with me to a junkyard, removed a wheel from the Taurus, and actually bolted on the donut to make sure. The wheel I got was a plain steel rim, with holes lined up around the center hole that actually lined up with one for the index pin! I paid $15 for it with no tire.

Next, you'll need to do some grinding. I did it the hard way, with a 40-year old Sears rotary tool and some rather large grinding stones. If you have a buddy with a machine shop, this part should be easy. The center hole will need to be expanded a bit. I worked on it for about an hour off and on, trying the rim every 5 minutes or so (I'm sorry that I didn't take any measurements). Don't worry about the index pin, just drill a nice big hole for it.

I sealed my work with some paint, but I'm sure this wasn't absolutely necessary. Just make sure that the center hole is large enough and you should be all set. The backspacing seems almost perfect, and with the right size tire you could drive on this spare cross-country at highway speeds if necessary.

Hope this helps!

Mike
1998 S70 Classic Red