Hello Steve
This information is from the thread posted below in which it is explained by Charles Bavarois and John Manrho that the Namentliche Verlustmeldung for Lang provided by WASt gives the loss information of his aircraft as being Fw 190 A-5 (W.Nr. 0150 1240). Credit for this discovery should also be given to David Brown who realized that the werknummer block for the A-8 that he is usually claimed to have flown that date does not exist. I hope this helps.
http://forum.12oclockhigh.net/showthread.php?t=15822
Horrido!
Leo