You can buy a kit that includes the clips, pins, rubber boots, etc. Sometimes these parts can be reused, sometimes removal is destructive or corrosion makes replacement a necessity. In addition to Toyota parts, Centric brand offers the kits (front and rear at a different part number).
Here are the part numbers I had saved from another post, you probably want to verify them:
Centric Brake hardware kit - 117.44090
Centric Brake hardware kit - 117.44089