Originally there were right and left side motor mount.
The 8th of the 10 digit MBZ part number when even is for left side parts, and odd when for the right. 0 usually means for both sides
ex
113 123 01 17 (right)
113 123 02 17 (left)
This is a fictitious part number
Al Lieffring
66 230Sl
Jones'n for a new gas tank