Opp ran his first Indy 500 and a couple other events in 1974 in a Parnelli Viceroy car. Here is a picture from the 1974 500, notice the suits are very similar, minus one patch above the firestone patch.



I also have a handful of pictures of Opp running sprint cars with what appears to be duct-tape across the front-top part of his helmet, also wearing a face mark guard that wraps around his helmet.