My Dell Precision 5560 laptop has worn-out rubber feet.

No -- you would need to replace the base cover.  The rubber feet are not available separately.
The part costs about $10;  there are many on EBay and elsewhere.

Can you give me Link of these product. But It's original of Dell Products or common rubber feet. I hope Dell can hear me and support. It's too easy to support when you have an company of them.