* Change 2 Part Black {3475 Engine, Smooth Small, 1 x 2 Side Plate (Undetermined Axle Holders Type) to 3475b Engine, Smooth Small, 1 x 2 Side Plate with Axle Holders}
Comments from Submitter:
they have to be attached to axles thus must have axle holders (step 32 in the instruction).
* Change 2 Part Black {3475 Engine, Smooth Small, 1 x 2 Side Plate (Undetermined Axle Holders Type) to 3475b Engine, Smooth Small, 1 x 2 Side Plate with Axle Holders}
Comments from Submitter:
they have to be attached to axles thus must have axle holders (step 32 in the instruction).
Very good! I have searched many times to find a set that required this variant,
but apparently I never got to this one.