Long one with curved ends is a top of windshield stainless molding.
measurements of its length or laying in on or comparing the width to a 61 or 62 bubble top - top of windshield stainless should determine which model it fits.
I think 61 & 62 ( and maybe 63 & 64) impala 2 door hardtop models and bubbletops in 61 & 62 are the same.
Length measurement of the stainless you have compared my top of windshield stainless on my 62 impala 2 door hardtop (61, 63 & 64 2 door hardtops are the same)
The stainless with the large curve is a passenger side back window glass upper stainless piece ( it has the short ribbed overlap on on one end to cover the drivers side stainless back glass stainless)
it may be for a bubble top for the passenger side upper stainless ( it could be from a 62-64 2 door hardtop back window upper stainless , but it appears to have too much curve in it for those models).
Paul