You can find one in a forum or by doing an online search. You can also go to the automotive dealers website to order one directly. For a much cheaper version I would strongly recommend going to Ebay or any other online store! There are also support forums that you can usually find a page or two.
You can search online to obtain a technical manual for the 1977 MG. If one is not available for reading or purchase online you can contact the vehicle manufacturer to see if the manual can be obtained through them.
