iMac G4 SSD to Hard Drive adapter....it work with the stock iMac G4 screw, you just need 2x or 4x for the SSD to the adapter
also use StarTech IDE/Sata adapter i try some 10€ one on amazon and nothing work....

if your iMac G4 freeze/stop/crash after this just be sure to applay a big quantity of thermal compaund on the 2 part who touch the HEATSINK!!

(missing this step cause me so many crash almost impossible to use it!)