I didn't separate the inner from the outer. I looked for a long time to find the five that I have (I have one in my garage as an extra because the spare tire cap is from 3100) They're very hard to find. but just keep trying. I got two from the stovebolt swap meet and three from ebay. A good driver quality cap might go for $50 and up. I'm cheap so i waited to find rusty dented ones for $25. And finished them as I described. Good luck
