I looked at the parts manual for the 1973 model 2086 HT20 vs. the 1974 and up model 2087 HT20 and the part numbers for the decals are different.
I also looked at the G10 parts manual, and they had 2 different decals. One for the 1973 and a different set for 1974-1977 models.
That would lead me to believe that the change from gold to red was made in 1974, and was probably across all models.
I also looked at the G10 parts manual, and they had 2 different decals. One for the 1973 and a different set for 1974-1977 models.
That would lead me to believe that the change from gold to red was made in 1974, and was probably across all models.