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Base- springs are the only option, (non-adjustable spring perches).
Z51 only - has adjustable spring perches (think factory coil overs), and you can adjust front and back 1/2-3/4 of a inch.
Front lift - weather normal, Z51, Magride, or Z51&Magride. (non-adjustable spring perches on front) have to use lowering collars, or springs or both.
Mag ride - Adjustable like a Z51 (think factory coil overs), and you can adjust front and back 1/2-3/4 of a inch.
You can use springs on all of then, need collars on front lift cars. the mag ride and Z51 gives you adjustable factory but the font lift removes that for the front.