Brill, so I can still use the one I’ve ordered. Certainly looked the same on the pictures and defo didn’t have the tab on the back. Also had the terminal screws top and bottom. Only difference I could see in the pics was the clip that holds it to buzz bar was black as opposed to white on the original ones already in use. I’ll be able to do a proper comparison picture once I get it which should be tomorrow.
Thanks again everyone for your help!