motobecane gurtner stock air box

stock air box for some motobecane 50v models!

there are two styles of stock gurtner air filters....if i remember correctly, pre-march 1977 moby's use a center mount carb and take this style air filter where as post-march 1977 moby's with the long side shooter intake use a through bolt style air filter, but hey what do i know? do i look like a gurtner expert? double check and make sure this is the style you need plz.

treatland