This is a grill that a good friend of mine has made. He started with the single bar Opel grill and converted it to Vauxhall.
You will see the small honeycomb grill that sits behind the grill has been removed. As this has gone on his Astra SRi Turbo, he has used SRi Turbo mesh to match the bottom grill.
I think he has done a cracking job. He is currently doing my OPC grill for me, so it should look like a proper Vauxhall grill when he has done.