I don't know about the DJ-5 springs, but considering that DJs are 2wd and they all were pretty much beat to hell and back......I would doubt they make a good choice
Your factory rear springs are 2" wide aren't they? The later CJ rear springs are 2.5" wide. Also, I THINK your springs are shorter from eye to eye. I would imagine the later springs would be an easy retrofit, but it would require some reworking of the spring and shackle mounts.