ran into a lil problem today. as i was changing the oil, and the filter they looked up does not fit. and i can't find one in my town.

they looked up the filter in the computer and it looked similar to the one i put in my w116. but the one that came out of this one was shorter. i always thought that they were the same engines. can anyone help me with this? does the filter vary in the 82's? do they have it at fast lane, or should i go to a dealer?.