The Bosch 9230081050, or "050" distributor was never installed from the factory on a Porsche. It was, in reality, a Brazilian Industrial distributor. It was an extemely popular replacement for the old "Cast Iron" distributor because the advance curve was similar and the price was very affordable. Sadly, Bosch discontinued the 050 in 2003. Recently, they discontinued the distributor caps and rotors.
We still have a few caps and rotors, available together as a set.
See also: 050 Distributor Tune Up Kit