Spare bit for VTSSC50N

I am in Italy and I have got a Velleman VTSSC50N soldering station.
Since I need a BITC50N3 spare bit for it, I have inquired the italian Futura Elettronica (Velleman distributor in Italy) web site and surprisingly I discovered they don’t sell BITC50N3 and BITC50N4.
How and where can I get them?
Thank you for any help.

I think you can contact Futura to ask about availability

Perhaps they can custom order it for you