Hi,
Some from the Adler's car was in Israel, one of them my father own, it was Adler Trumpf, Black 2 door, as far I may remember from 1939??, I can remember that my father help one of is friend to buy Adler with 4 doors.
Maintenance/spare parts (original) was rare, so Citroen Traction spare parts was sources option and fit, as well Adler parts use to be fit in Citroen Traction.
It was FWD car, so the transmission system & gearbox parts fit each other. I sold in the early 70th Adler mechanical spare parts to Eiche Mamboche from Ein-Hod for is Traction.
I can remember my father mention several times that Mr. Heinrich Kleyer "smuggling" the Citroen Traction to is Adler Trumpf (before WW2).
You may find more information by;
http://www.adler-veteranen.de/engl/eamvchom.htm
http://www.gallustheater.de/ges/adler.htm sorry in German language
http://www.karmann.com/__C1256DF700512B86.nsf/html/en_search_result.html?opendocument&search_mode=ft&language=en&ft_search=adler&results=5&ix_search=100+years+Karmann
Hope the links will be helpfull, enjoy them and soon I will find pictures from our Adler with Israeli registration number.
Doron