geforce970

Hi guys, I hope you can help me. My standard ASUS Geforce GTX 970 got toasted a few days ago. I ordered a Gigabyte Geforce GTX 1660 Super OC 6G card, which arrived today. Just tried to fit it in, however it won't fit in my PC! :( Do I only need to look at ASUS cards? Or can you help me to find...