Klippan Seatbelt Installation

[Jordan]

Would anyone have or know where I can get installation instructions for Klippan seat belts, model 8012, part number 114 860 17 85.  I would like to install these in my 71 250C.  They came out of a 280C but I did not see them installed.  They are retractable and would replace my existing non retractable belts.  Any help would be appreciated.  Thanks
Marcus