Considering the time frame, the crash place and the fact that some other planes crashed in that bigger area around Pirmasens-Saarbrücken
this crew probably was lost on a mission to target MANNHEIM and should be one of these:
http://www.lostbombers.co.uk/results...&submit=Search
There are some in these reports without a given crashplace, maybe one of those?
Stirling/Halifax not an option???
bye, good luck,
FrankieS