If you want one as an exact twin to the one you already have, it might help to post a pic of your actual one - these coaches have been made for a LONG time (almost as long as LGB has been around) and have appeared in many, many different versions - different shades of green, different roof types and colours (dark grey, light grey, silver, some with ventilators, some without), different markings on coach sides (eg: some have the large white destination panel, some don't).
If none of that matters, of course, then any green version of the model will do - but just be aware that ones from different eras can be of very different appearance.
Jon.