Mega Man X2/Upgrades

Leg (Mid-Air Dash)

 * Stage: Overdrive Ostrich
 * Items needed: Spin Wheel

Helmet (RADAR)

 * Stage: Crystal Snail
 * Items needed: None

Body Armor (G. Crush)

 * Stage: Morph Moth
 * Items needed: Spin Wheel

X Buster

 * Stage: Wheel Gator
 * Items Needed: Mid-Air Dash