It's chrome, it should have chrome backed decals.
If you use clear any finger prints on the sticky backing will be seen for evermore.
If you have the 4130 under the GT stamp on the bologna cut then you can use GT Pro Performer decals.
If you do then is it US made or Jap made?
Jap made frames had different Pro Performer decals. The print of
Pro is in more of a bold font.
Anymore questions fire away