Technical 500 sport robot hose help

[Paul112004]

Hello everyone I am currently trying to repair a friend's fiat 500 sport selespeed
I accidentally snapped the hose that goes from the tip of the hydraulic oil reservoir into the robot.
I'm assuming it's the return hose.

I'm not so worried about the hose I can replace that but it's the part the hose is attached to that I can not find anywhere or even what it's called.

I asked fiat they say its all sold as 1 unit so can replace that part.

I was thinking maybe thread a hose thread into the hole as when it broke it turned around easily so l think it's only held in by itself and under no pressure

Has anyone had this problem and found a solution to replace the part the inserts into the robot

Thanks paul