Replacement Wheels for National Equipment Ride-On Scraper that have double  wheel caster. 4 inch x 2 1/4 inch. (For undamaged caster) This listing is for the wheels only (no hardware)  These exceeds OEM load capacity of National Equipment's 5200-194-A

Available individually or in set of 2. 

Complete caster set for the National 5000 (5700, 5625) series ride on machines Available HERE