I recently joined the 75 and ZT Enthusiasts forum. It may not be one of the most popular forums available to people with our shared interest but still well worth joining. Apart from a well laid out forum it has a WIKI section with a wealth of information about our cars. There is also a section with build info that you enter your VIN no.
A very much under rated forum that I would recommend to anyone with our cars to join at …… https://forums.75-zt.com/