ECS Automotive Concepts produced the RT decal at one time and may still have it, just not show it.
https://ecsauto.com/collections/gm-d...34709550203041
Member burd states he lent his PL decal (or PF, W72, not sure which) to Jim Osborn Reproductions and had them reproduce it correctly (I kind of doubt it, but who knows).
https://www.npdlink.com/product/air-...ro/216680/8213
https://www.npdlink.com/product/air-...m-repro/216703