hi Multihull, we are talking about the same glow plug, only difference is which way you are looking, front of car to firewall (ME)
or looking frontwards (YOU)
And as GoÁrd has mentioned you can get down behind the wiring etc with a long socket it just looks impossible. I just found it easier to take the engine cover support bracket off (off the rear wall) and it seemed to give me a bit more room, maybe that is just my idea and doesn't need to be taken off but it is only one bolt..