That does sound dodgy if they asked you to update you account thats what the spam emails normally say.I use mine every day never been asked to update my account
Yes im sure there is enough room to knock them out.Could be much worse front ones you need to strip whole hub and brakes out.Be aware when ordering new ones fronts and backs are different
If its the late bumper I've got waiting list they are sold as soon as I get them going rate for good ones is around £200 but as you've already found out they are extremely rare