Redesigned during production.
There are at least 2 different versions of instructions for this set. The differences for the second version are indicated in this inventory in the Alternate Items section with Match ID 99.
Quick overview of redesign: A white 2 x 6 plate and a black 2 x 3 plate are added underneath the chassis for support. A 2 x 2 inverted slope is replaced by a 1 x 2 brick to make room for the new plates.
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