[Mr70]

I'm showing many dealers still holding inventory on these,but it's the later more common shorter,white plastic cap design #989276,not the earlier longer 1970 original metal cap design of #9417745.I've only seen the metal cap design as an accessory for luxury/economy models and not installed on the line for any Hi-po models.
I bought a box of the later in the bag design #276 in the picture above back in 1992 from a local dealer here.
I'm pretty sure those in the bag above picture were available between 1985-98.