I got a thick folder of work order receipts with my '87 930 when I bought it in July 2006.
One of them is for a top end and transmission rebuild dated 3-20-2000 when the car had 99,018 miles on it. New rod bearings are in the list of parts replaced.
When I rebuilt the top end last May the car had 129,592 miles on it. I replaced the rod bearings and saved the ones I took out.
I just took this pic of the numbers on the opposite ends of two of the ones I took out. The one on the right says 07-99 so if that is a date code it makes sense.