Strida MK1 repair/missing part

Hi there, I own a beautiful old Strida MK1 and I am looking for some spare parts:

  • the plastic ball socket (with “Strida” written on it)
  • the wheel clip (the part that looks like a crown) that keeps the bike closed (“clipping” the wheels) when folded
  • the security clip/lever which keep closed the bike while riding
    Do you have those pieces or know where to find them or have any idea of replacements?
    Any suggestion (doable for a non-mechanic-man such as me) will be appreciated, thanks so much!
    Kind regards
    Emanuele