This is a direct OE Spec replacement for the original ZR2 spring (It will not fit standard S-10 and Blazer models).
The ZR2 pickup came with two different OEM 4 leaf springs. This is the only version available in the aftermarket. This version has 1" less arch and may result in a lower rear ride height. The only way we've determined to tell the difference is measuring the pack thickness. This spring measures at 1 11/16" vs. 1 5/8".