Thats what i thought but ive since realised its not quite as easy as that, i went down the local breakers and managed to find another sierra with the fusebox holder i need (the one thats held in with 4 bolts) thinking i would be able to just swap the holders over like you have suggested, i have now realised though that not only are the fuse box holders different but also the actual fusebox itself as the holder i need to use which i got from the breaker is not deep enough to hold the fusebox that is connected to my original loom so once again im a bit stuck as to what to do.
The only things I can think of is Firstly to either try and cut off the base of both holders and try and bond the base of the new holder to the sides of my original holder so i can mount it to the car correctly but i have a feeling this could end up looking like a bit of a bodge or Secondly to remove each individual wire from my original box and re-attatch them to the new box, only problem with that is the layout of the 2 fuseboxes is not the same so the fusebox wiring diagrams would no longer tally up correctly.... but i suppose that wouldnt be the end of the world, it would just be nice to have it right!
Any suggestions welcome!