[Jim Sims]

They are all air conditioner compressor support/mounting brackets. They are Porsche parts with part numbers. The top item is the main bracket; the second is a sliding part used to adjust belt tension. The compressor bolts to the second item, the second item bolts to the top item. Note the slots for clearance for the various bolts and nuts. The third item is the bracket that supports the top item at the back; the third item attaches to the PS cam tower via slightly longer studs and nuts. The fourth or bottom item is a strut that supports the first item from below; the fourth item is attached to the rear engine mount console just to the right or driver's side of the main crankshaft pulley. You are missing a third strut (simple piece of bent bar) that also supports the top item off the PS chain case to engine mounting studs.