UTRUSTA hook (head)
I bought the kitchen lamp Utrusta and along come smal hooks that you attache to the back of the lamp.
Here are that hook "head", the part that goes into the lamp.
Use it to make your own attrapps.
I used PLA for mine, it's what I have home at the moment.
Link to the Fusion 360 file http://a360.co/2p952yv