Well heres the writeup.
Take 4 margerine or butter containers you have lying around your house and they will fit in the wheels.
1. Trim the lip that the lid snaps to off but leave the other smaller one on there.
3. Paint with Krylon Fusion Paint
4. Let Dry for a few days
5. Put them in and they look great and they dont rust and are very cheap to replace, I made a few extras just in case.