They look like 6mm and 4mm to me .
The outlet shown in post 5 can easily take 10mm . option B if I am understanding you correctly.
Click 45a Easyfit Dual Cooker Appliance Outlet Plate - https://www.alertelectrical.com/click-45a-easyfit-dual-cooker-appliance-outlet-plate.html
The outlet shown in post 5 can easily take 10mm . option B if I am understanding you correctly.
Click 45a Easyfit Dual Cooker Appliance Outlet Plate - https://www.alertelectrical.com/click-45a-easyfit-dual-cooker-appliance-outlet-plate.html