251 Rod small ends

[Jack L]

 I was entertaining thoughts of picking up a set of, supposedly, NOS rods. Although the rods I was looking at are identified as 954428, the same as my current set, they are lacking the hole in the small end. A different application? A running change? An earlier, or later configuration? Or, what was referred to in the aircraft engine industry, a "suspected unapproved part"

 

Thanks