Height-Adjustable T-Arms for Volt Series Task Chairs Black

I wanted to return it because I thought it was for the chair but it was just the arms I was told that Walmart could not take back I contacted the 3rd party seller and was told I would have to return it at my expense and it would have been expensive because of the weight or I could get 15% of my money back which I took a whole $7.00 dollars and I am stuck with something I can't use I will never why from a 3 rd party Walmart seller Not happy at all