This fits perfectly to Ryobi model OHT1845. It might fit some other models too, but not the ones with hedge sweep attachment in its place. Also blade guard needs to be off, but at least mine was so tight that it's impossible to use anyway.

If anyone knows what is the difference with Ryobi OHT and RHT models, please leave a comment! I did not find the answer with google.

3MF file has part in their best printing position, you need to print with supports, but you need only little bit of them. STL file does not have optimal printing position, but you'll figure it out!

Upper part of the hook is little bit off centered, to allow you to screw them to the ceiling.