Shower Head Manufacturers I Need Help Locating And American Standard Shower Cartridge?

I need help locating and American Standard Shower Cartridge? - shower head manufacturers

The website and customer service are unnecessary for the manufacturer and not see the situation, locally or online. There is a shower / toilet produced for a carton of white porcelain handle only between 1995 to 1998 and equipped with 4 Phillips screws. There are 4 outlets is the cartridge gray plastic / ceramic with the word "low" means that the address for the installation. There is no model or serial number found # #.