Greetings all, went to do a coolant change on a friend’s ‘09 HSE and as soon as I tried to undo the plastic rad drain plug, the head sheared right off. It’s a BEHR radiator and the drain plug is red plastic, same as ones I’ve seen on BEHR radiators in late model Mercedes but since the head sheared off, I don’t know if the shank of the plug is the same as the ones on the Mercs (which are available to buy as a replacement part). Has anyone had one out and can you tell me if the shank is just threaded or if it also has the little hook ends to hold it in the drain petcock? I’ll have to somehow cut a notch in the shank to back it out but don’t want to do that until I have a suitable replacement on hand. Thanks in advance for any help!