It's a '67 Impala. I was mine way back when. I picked it up back in 86. It was one of those "little old lady" models with 36K on her. Gave it to Dad when he needed another set of wheels & when he departed, it became my sister's (Penny).
I'll answer for Pianoman, he has helmet locks (keyed) on the license plate bracket (not stock) which holds the helmets nicely. Mine are on the Leatherlyke saddle bags which are covered when the lid is locked shut. I like that approach too.