What is the name of this item?

[Red Horse]

I lost mine in the road.

where can I buy this?

[CTScott]

That would be the "Seal, Rear Bumper Side":

For your sedan the part numbers are:
LH: 52592-52220
RH: 52591-52230

[Red Horse]

cool thanks I found it on toyotaparts.overstock.com