It was advertised as a 16v replacement filter for a 16v Astra GTE.
I bought it.
I got it and my first thoughts were, that's not big enough. It looked smaller than the one I had in my GTE 16v and Cav GSi and I was pretty sure it was too small for the Astra GSi.
My initial thoughts, were Astra GTE 8v, or Astra 8v, maybe 1.8/2.0.
K&N on the right, standard paper on the left.
So, name that filter.