I have an older model (~8 years) and one of the wheelbase arms broke off. DXRacer was responsive to my email question and told me which base would work with my model. If you're looking for parts, the links can be found in the FAQ question: "If my chair's warranty has expired and I need to purchase corresponding parts, what should I do?"

Because the armrests are pre-assembled and because most of the screws are already in the right place, assembly was a breeze. What this implies is that you may quickly position the part to be attached, loosen the screws, and then screw it back on. The assembly is, overall, quite easy.

These chairs are incredible, and the customer service is even better! Honestly, it's the best customer support experience I've ever had. Keep up the great work!