If you happen to bend the hub cover taking it off, do go get a new one...the're about $ 2.00 a piece. Other-wise, you'll have a mess on the wheels as the grease gets warm and thins out. Those caps can be tuff to remove without damage. I made a tool for installing these that keeps from doing that..... took a hole saw, bored a hole in a 2x4 that rests against the rib on the cap and you can install them fairly straight or you could slightly taper the hub end with a file to ease the installation.
Bob/Linda, 99 Dodge 2500 Cummins,2010 8280 Rockwood Ultra-lite 5er, PullRite Superglide-----
I'm retired......but work part time as a pain in the ass!........... USMC.