do you mean the one between the bulkhead and rack? if so plentiful in scrappies as loads o mk3s turning up in there now. pas different to manual steering so make sure you get the right one!
what you have to do is pull the steering column up a bit, inside the car take the wheel and stalksoff, then undo the bolt holding the lock housing to the outer metasl tube. its a shear bolt but should come undone easily as they're usually good at self-loosening. then undo and remove the nut and bolt holding the column to the uj in the footwell, then yank the column to release it. dont looser the spring

then go to bay and lift up the boot a bit then remove the bolt holding the UJ to the rack and pull it off. back inside the car pull the UJ back inside the car and the boot will come off. its a little fiddly with the engine in but it is possible