Need taller springs for my k30 dually

[dragn91]

My k30s springs are sagging terribly and i need to source some replacements can i use a 4 inch lift spring spring from a k10? I only want it to go back up to stock heigh maybe plus an inch ive been looking for a used set of cucv springs since there usually low mileage i figure they wouldent be as beat as mine maybe add a zero rate to it but cant source any but cane across a set of 4 inch front and rear lift springs for a k10 pretty cheap id ony use the front but i was wondering if they would even fit under a one ton or hold the weight? Any suggestions