I just put those rims from my Spirit unto my new Kammback. I can confirm that the Spirit has smaller brake drums and overall width of the axle, so the rims fit on the back of the Eagle without rubbing against the spring like the Spirit did. The nut of the axle sticks through the hole in the center, so its confirmed that the rims cannot be installed with the center cover unless you use a spacer. Without the spacer, the lug nuts only turn a few times before they are tight against the thickness of the aluminum. I do not consider them safe that way without longer wheel studs pressed into the axle.
On the front, however, the rims simply did not fit. They wedged against something, either the caliper or the raised edge around the CV shaft. I bolted it in place for a picture, then had to use a rubber mallet to remove the rim afterwards. It was wedged and slanted in place and wasn't actually bolted in where it belonged. On the Spirit the rims bind up against both the ball joint and the caliper.
I installed my 1.5 inch in the front and 2 inch spacers in the rear. They fit perfectly and look much better that way. In the front I suggest using 1 inch instead of 1.5 inch, but 1.5 inch is perfect for the front of a Spirit and still works great for an Eagle. I took pictures but can't post them today.
Do not install them without spacers. Even if the front didn't bind up the way it does, the wheel studs are too short to use with aluminum rims safely. The spacers come with much longer studs built in, so they are much safer to use than without them. Do not listen to those who say otherwise. The spacers are stronger than the axle. I've had 3 axles break and no spacers break. If you really want a strong axle, you need a Cherokee Dana35 which happens to be wider and with longer studs to accept the rims perfectly.