Hello Ilija. Welcome to our forum.
I can't read German, but through Google translate http://translate.google.com/
, I understand that you are interested in Hermann's bikes.
It may not be possible, but if you are able to use English, there is a wider group of people who may have the bike or parts you are looking for.
Are you looking for a 1930 Ariel?
Also, I am interested in the way you "sign off" LG. I've noticed that Eero uses BR. Can you explain what this means?
51 Square, 48 VH, '27 Model C, R67/2, Mk IV Le Mans, and a couple of Ariel projects.