how easy would it be to fit a fuel computer unit in the cab and what models came with a standerd one

Despite the early mk4 ghias comming well equiped as standard, there still some additions to be made.   Ive noticed that a few of of our european counterparts, have headlamp washers fitted into the front bumper.   Does anyone know if this option was offered on uk escorts(mk4).and to what models if they were

right im starting moulding 3 ten inch subs into my boot tomorrow(fibreglass)is there anything i need to consider....other than it needs to be able to lift in and out lol,and access to the roof pump.   will try and do a write up of how its done too,should be pretty professional as my dad is helping and he is the manager of a fibreglass moulding company