I share with you my discovery.
Information on the day and month of assembly of the finished frame "September 18".
I specify a date of end of manufacture.
Must also be present on your trucks.
My photos will help you identify the location.

Ps:
All the parts forming the frame have a number, 35242 for CROSSMEMBER ASSEMBLY, REAR this number can be specific to M724.

The source of the topic:
http://www.m715zone.com/vb/showthrea...t=29903&page=6