This is an outstanding study of carbine configurations based on photos taken at Normandy and other ETO operations. Click on "Source Photographs used in the Study" at the bottom of the page. Also read the author's conclusions as to high vs. low wood stocks etc.
This site is a tutorial for WWII re-enactors and the proper way to look for accuracy.
90th IDPG The M1 Carbine in Normandy: A Case Study