This script allows you to overlay 2 other timeframes' open and close over your chart. It also has the option to overlay Heikin Ashi candles open and close over regular candles and vice versa, simply change the values in the settings. You can also set alerts for specific open/close.
Versionsinformation:
Changed the input for the time resolution for more flexibility.
Versionsinformation:
Added painted area between open and close
Versionsinformation:
FIxed the problem with alerts not working