TIP:
The PX models use a total of 4 screws.
The older models such as Rally, Sprint etc. use this type of screw only for the lower mounting brackets, i.e. here only 2 screws are needed. The upper hexagonal fixing screws are located in welded-on sheet metal pockets and are secured against rotation by the rectangular shape of the pockets. If a luggage compartment is to be retrofitted to models without such a compartment, these pockets (not available as spare parts) must be made and welded on and the holes for this set of screws must be drilled in the frame.
This should ideally be done before the painting work of a restoration.