You could try part-people web site. They appear to be out of stock now but you can contact them to find out the status of their orders. At their site type in your service tag number and it will confirm your motherboard. Also you can call Dell parts and with your service tag number they can tell you which motherboard you need.
The phone number to spare parts is 1-800-372-3355...be ready to give them your service tag number when you call.
-Forum Member since 2016 -I do not work for Dell -A user helping other users -If you like an answer please click on thumbs up -If a reply is a solution to your problem please click on Accept as Solution Gaming on a home built ASUS B450-F Gaming with Ryzen 5 2600X Real work on an Inspiron 15 5575