On our Superba, there is no 'remove the back'. It's a solid internal cavity. Here's how to do it:
1) Take the door off (have help, watch the video. It's awkward but not hard
2) Have a buddy help you, support the old burner, take out the two upper screws, and the two rear screws
2a) Put one or two screws to hold the upper heat shield in place while you work
3) Slide burner out. Takes some wiggling and pulling, be gentle but confident (it can sense your fear)
4) Use needle nose pliers, do not grab the space by the head, grab the neck, wiggle/jiggle the spades off
5) They will retract but should not slip back into the unit.
6) Install the new unit, have someone hold it at about 160 degrees and hook up each spade. They will have to switch sides with you.
7) Be careful on re-inserting, Elements are fragile
7a) A headlight is helpful, I just did it with the oven on... don't turn the oven on while working :D