Rear shock absorbers with different markings.
 

Hi, guys!

Perhaps I have a problem.
In September 2010 I ordered a rear shock absorbers through Ebay. Shock absorbers, "Monroe" had been delivered to my home and I kept them until today. Today I'm starting to replace shock absorbers - but I see that one differs from the second.
And so:
The first has a sticker "Sensatrac" and marking "P201D.
The second has no sticker, marking "P137D.
These shock absorbers have different characteristics? Or I should not worry.
Any information / help.

geg, I'm not finding anything with those numbers, but the shocks should be the same for both sides. Those numbers you see may be manufacturing sequence numbers or something, and not "part numbers". Part number should be 5779

Yes. I know this number. Thank you for the information.
Here are my shock absorbers.

https://www.chevyhhr.net/gallery/fil...5/P6153440.JPG

This - marking. Below you see the numbers - 201 on the first and 137 on the second.

https://www.chevyhhr.net/gallery/fil...5/P6153445.JPG

Today, I actively made inquiries. Communicated with dealers "Monroe" in Ekaterinburg, with specialists in the repair of the suspension. They all believe that the shock absorbers are identical.
Perhaps the numbers at the bottom - is the number of consignment or something like that. An hour ago, my supplier Gary from the company "northenautoparts "wrote me - shock absorbers are identical but are produced at different times.

Well, have to believe.

Yes geg I believe you are looking at production codes stamped into the shocks to track batches produced in the factory. If you look above the instructions stamped into the barrels of the shocks you will see the part number 5779ST which is the correct number for your HHR.