From the plate on the door, the car was built Nov 87.
While I agree with Steve's sentiment, this is bit of an oddball situation. I am doing something which is not immediately critical because it is convienient now, and likely will not be when it becomes necessary.

Thanks to you guys for the reinforcement; I really wanted all the guides replaced, but did not want to appear so presumptious as to tell someone who looked at these things every day how to do business.

It seems if this is enough of an issue to reengineer in the middle of a production run, it may as well be updated while it is easily accessed.
Perhaps since the car is an 88, he assumed it already had the updated guides.