Astromech Droid, R5-D4, Plain Dome

Leg Mechanical - Droid with Technic Pin

Brick Round 2 x 2 x 2 Robot Body, Axle Holder '+' Orientation with Gray and Red Astromech Droid Print (R5-D4)

Brick Round 2 x 2 Dome Top, Blocked Open Stud, Bottom Axle Holder

Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)

Sandcrawler