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?"

My kids have been using these chairs for awhile now and I have to say I am pleasantly surprised how nice they are. I really don't have anything bad to say about these chairs. For the price, they are definitely a great bargain.

This chair has been a game changer during long work days- provides great support, is comfy, shipped quick and was easy to put together.