Taken from a new Rustler 4x4. 

Updated version of the chassis to fit longer batteries, includes front bulkhead, tie bar and pins, motor mount, plate and cover.

This chassis uses an updated front bulkhead (included) and does not fit the standard Slash 4x4 LCG (ultimate) bulkhead or aftermarket versions.

You can convert a Rustler 4x4 with the original chassis to the new chassis with these parts, or a Slash 4x4 LCG to a Rustler 4x4 with these and some additional parts.