This is the A Parts (Chassis) used in Item 58593 M-05 Ver.II PRO Chassis Kit. They can be used to replace worn or broken parts in your original M0-5 Ver.II Pro or they can be used to update you version I kit to Version 2 specification. Specs and Features: •Compatible with square-shaped battery packs and low-profile servos. •Moves motor position 3mm closer to center for improved balance. •Compat ible wi th one-piece lower suspension arms Item 54606 •Compatible with M-05 Ver.II PRO, and other M-05 Chassis variants.