1/2" to the spring, you're fine. I've run tighter than that for years.
If you had 1/2" to the fender, THAT I would worry about.
Now, crawl under the car and see how close you are to the inner wheel tub. Often closer to the tire than the spring
IF you have long enough studs, you could add a small spacer.... but NOT the universal fit cast garbage!
If you are still 5 on 4, you'll need to use a 5 on 100mm spacer. Not perfect, but close enough for a spacer. NOT close enough to use a 5x100 wheel, however.