Welcome to the Forum.
Yeah not sure what car you are talking about.
I know the top mount is the pricy one. there is a thread here, maybe MACH4 did it, but cleaned out the old rubber and filled it with Liquid Rubber. Much cheaper.
The small Shocks are to cut down of the side to side motion of the engine and cuts vibrations, especially when it is turned off. saves the engine mounts some.
List what cars you have down in your signature so we don`t have to ask what is in your Stable. If you have several, list which Carriage it is.
Charlie