When I bought my SS350 a long time ago, it had no stripes and no emblems and just a bad paint job. I planned for the DX1 stripes eventually when I did a repaint, so I bought them and have stored them for all these years. More knowledge and years later now, I'm ready for a repaint, and I lsadly realize that DX1 was an option for non-SS cars - so I will get the boring everyday SS hockey stripes. Your car looks great and I was very tempted to do the DX1 stripes anyway.
DX1 black stripes NOS in boxes are on EBAY, special deal to any CRG members.