Front Wheel Assembly for the Razor MX350 (Versions 9+) and MX400 (Versions 1+) Coleman Powersports BT200X This lower extension may be Shoprider Echo (SL73) This lower extension may be used on either the left or the right side of your Quantum power chair with the #8 swing away footrest Our set of two wheel locks for transport chairs with 8" casters allows the attendant to engage the wheelchair's "parking brakes" to prevent any dangerous rolling Note: Model versions can be determined based on the product ID code on your Razor product The product ID code can be found on the battery cover and or on the bottom of the frame