If upright shocks then all you need are 2 x short M8 bolts. These bolt through the 2 tubes sticking out, and through a couple of brackets on the frame where the seat would bolt on a 3C. On a 3CL they are redundant.
The 2 larger holes go outboard of the upper shock mounts and the upper shock bolt passes through them, the shock mounts ad the frame bracket.
The 2 small brackets at the rear of the grab rail are for indicators.
Will try to find a photo id still not clear.
On later 180s with angled shocks the upper shock mounts are redundant and 2 spacers are required, the same width as the upper shock bush width, around 25mm or so. Special spacers are available but you could use cut offs from an old pair of handlebars if stuck.