See Astromech Droid
Like most other astromech droids, R2-R7 is made up of four parts: two legs (in R2-R7's case, these are white), a body piece with green markings, and a head piece with silver and green markings on it. To date, R2-R7 has made one appearance in LEGO, in the Limited Edition 7665 Republic Cruiser, making the droid exclusive to this set.
R2-R7 provided "inflight backup" aboard the Republic Cruiser Radiant VII when the ship transported Jedi Qui-Gon Jinn and Obi-Wan Kenobi to the Naboo system. Whether this droid was destroyed along with the Radiant VII is unknown.