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We have the largest Catalyst 4 parts catalog available. Find all the Catalyst 4 parts you need, including all Folding type models for Ki Mobility products. Catalyst 4 parts are available to be shipped directly from the manufacturer. Get the lowest prices possible on Catalyst 4 parts. Getting your Catalyst 4 back into working condition is our top priority at Wheelchair Parts. Call us at 800-236-4215 for assistance in locating your Spark parts.