That is called a ready strut. All new coil spring, mounts and strut, all assembled. That way, you don't need a spring compressor to disassemble everything to reuse your coil springs when changing struts. I didn't think they were available for the 95-96. I know I used them on my 98. Got them from rockauto. They were Gabriels.
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98 Riviera SC3800 All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
Best MPH, 116.06 MPH, Best ET, 11.54
https://www.youtube.com/watch?v=UHCda-t_Jls
https://www.youtube.com/watch?v=sfT2tEO4XcU