I contacted AppliancePartsPros and the gentleman guided me through ordering the right spring. I ordered 2 as suggested, as the spring might break again. It is stored in the fridge so we won’t lose it. I watched 1 video on YouTube which was very explanatory. Had I not found the video the gent from AppliancePartsPros said to call them back and they would walk me through it. I removed 2 screws which connected the million to the door. Then popped off 3 caps. I gently lifted up the mullion and slid in the spring, and eased the million back into alignment. Then screwed it back in and replaced the 3 caps. It works good as new now. I will say that there is a little piece of plastic that had broken off near the spring when it initially broke. So, if that becomes a problem the whole mullion will need to be replaced, all for a tiny piece of plastic. But so far so good!