The more bits you can get then the better, the thing you will always struggle with are all the small bits you dont think about, like the mounting bracketts for the ECU's and the new washer bottle (yours may already be in the correct place)

Drop me a mail at richard.hanley@edsgfs.co.uk and I will try and give you a more detailed account of what is needed, as I have done a few of these now

cheers

Rich