where can i get a diagram for the engine of vw golf mk1 1.8 cabriolet carmen convertible

my son has dismantled my car to ensure all the parts function and i want to make sure all the bits go back in the right places, if i had a diagram and instructions, i would not have to rely on my son, who has the wolfberg edition, which seems to have priority over my car. my car has spanish plates so i'm not sure what year it is, the person we bought the car from has lost the paper work, and unfortunately in spain, the car has to pass its itv before they will sort the paperwork. my carmen has an electric roof and adjustable seats.  the haynes manual we got does not have the same layout as my engine, and the wiring is different.  unfortunatley, my son has his fathers attitude which is i'm useless with engines etc, i used to tinker in my much younger days, my moto is you can do anything you put your mind to as long as you have good instructions.  sorry about the waffle, with 2 dogs and iguana for company 7 days a week, you go dolally