I had no idea A7s had drilled drive side con rods. Mine does not, nor has any A7 I have dealt with over the last 50 years. You can interchange the rods from Norton 88s and 99s, and thay don't have drillings either.
So, am I just ignorant or were drillings produced at some point?
P.S. My A7 has been thrashed to within an inch of its life for the last 60,000 miles and is still going strong.