I have purchased a pre-owned S-Tec System 50. It is out of a the same year Aztec with a Serial number 21 digits after mine. It has all harnesses, servo's, brackets, etc. included. S-Tec has quoted me $1800 for the STC and install drawings. Are there any other options for obtaining this? They have done a great job of keeping these install drawings from going public. I have been looking on-line for months and have come up with nothing.