LHD E30 uses the same fluid thingy for both brake and clutch,proper side drive requires a clutch fluid thingy adding to the o/s front(

)suspension turret.The correct bracket will be available to order from your dealer,or you can fabricate something suitable yourself.
Pedal boxes are vastly different between LHD and proper side drive,assuming we are talking a proper side drive car the easy option is to bolt up the manual type pedal box.
Be aware that auto's have a cunningly arranged wiring loom add on that prevents you starting the thing in D or R,this needs to be removed,trace the start signal wire,black/yellow,from the ign switch to the area behind the glovebox,there you should find that it is split with a pair of black wires wandering off in a sub-loom.Remove the black wires and as much of the sub-loom as is possible...it disappears beneath the carpet to re-appear at the back of the gear selector...re-join the two black/yellow wires.At the gear selector end,you only need the plug that connects to the reverse light loom that should come with your manual 'box from the reverse light switch on it's r/h side.
The 'proper' way to remove this sub-loom requires the carpet to come out,this also makes the pedal box swap a touch easier,but just hacking the wiring away at each end will do the job!