Review on BBK 1518 Throttle Seriesfor Mustang by Paul Wilson

Although the description says this is a direct replacement for the stock spacer bolt, you CANNOT use a factory throttle body. I know it says you should use a BBK throttle body. My mistake was that I assumed (I know) that a straight bolt on a factory spacer would allow a factory throttle body to be used. The factory IAC throttle body meets the spacer and prevents you from installing the factory throttle body flush with the spacer.