1998 Ford Expedition 5.4 4wd

This piece was sitting in my driveway where I
always park, which leads me to believe it came off
my vehicle. I could not find where it detached from
or have any idea what it could be if someone could
shed some light on this. Could be nothing but
better safe than sorry. It seems to be made of
rubber, but it’s pretty firm possibly from age. If you
are looking at the picture, the bottom is what came
detached but I thought the top would be more
helpful.

Thanks,
-Ford Driver