Marc uncovered several great G503 Russian site links.
This link includes information on jeep (and seep) manuals in english and russian. Here are a couple shots from the Russian book from 1948:
http://www.g503.ru/info/phpbb2/viewtopic.php?p=1460#1460
And here is a thread with many different pictures:
http://www.g503.ru/info/phpbb2/viewtopic.php?t=143&postdays=0&postorder=asc&start=0