Cross reference tons of sellers on ali and ebay
The one for 1 series e81 has shorter base than the one for x3. You wont need to make a bigger hole compared to the X3 model. Slow to get back as the time zone difference
https://www.aliexpress.com/item/3305...224e3e5f1NMMBd
Narrow it down to this seller.. shorter 1 series base, get the one with no original screen and it's 8 core with lte sim and factory connect wire. Onsale 11/11
https://www.aliexpress.com/item/4000...chweb201603_55