Extreme Wheelie:

One of the front wheels has been replaced with one with a round hole instead of axle hole. This will work fine if the round-axle connector is changed to round-round or if you just get a new wheel

Jump Master:

1x 370924

1x 485426 (replaced with same part with holes in plate)

1x 389426

1x 4227398

All of these are common parts and easy to replace! Great discount for the bundle.