There isn't really a recommended replacement interval. It is more of a replace the parts as needed if/when they are worn.

Springs don't usually get replaced too often, unless you want a different spring for a lower or firmer ride.

76k miles usually isn't too long on a pair of shocks unless they have been terribly beaten up on. If the suspension doesn't bounce, then they are good to go.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record