GEM hard doors... need a little help

I have a friend with GEM hard doors… he is in need of the locking body latch as I understand… think he has all the parts on the door and needs for it to stay closed… novel idea… the parts from GEM are $129… part numbers (left striker 0205-00309, 0105-00710, right striker 0205-00310 or 0105-00711)?

anyone have extras? or ideas as to where to look?? I don’t have a diagram… sorry…

Bob