Review on Rear Air Spring for Ford/Lincoln/Mercury Cars (Various Models) - Arnott A-2105 - Left or Right by Corey Moulton

These are sold individually. You have to buy two if you want to replace both sides. I did that because if one of them leaks, both sides will go down, meaning you can't tell exactly which one is leaking. And if one leaks, the other will probably start soon anyway. So it's better to swap both sides. Mine arrived quickly. And they worked great replacing the stock air springs on my '96 Town Car. It was a little difficult for me to unhook the old ones with my hands. However, it was easier to replace than some of the parts on this machine. I installed them about a month ago. No leaks so far. You save a lot of money by replacing them yourself. And they even come with instructions. I am very happy with this purchase.