For EFI you better get the set from Hitchcocks:
for the carby version its very simple and the description is here:
During 2021, the introduction of the Euro 5 compliant Himalayan models saw the removal of the air injection system making this kit redundant for the latest models. Please see the photo and ensure you have this fitted to your Himalayan before ordering this kit.
for the carby version its very simple and the description is here: