I had a problem with my front caps as well. I used a dremel tool and gently ground out the inside of the cap to them point where it finally snapped in place. I also got a few extra caps just in case I burned through them or they popped off. Its a good idea to get the caps now. If they stop sellling the wheels then its much harder to find the caps. I'm curious just how detrimental it would be if you removed the dust cap from the hub? I think the wheels have a cleaner, finished look with the center caps on. very nice looking wheels.
Pat