GenII coils will help - they are variable rate, compared to the singles in the genI. Anything from 92 up should work... will also give you a little lift too, since they don't sag as much.

As far as air bags, I've been researching this lately too, and found this thread helpful...


1991 HZJ77, 1999 KZJ90, 1999 UZJ100, 1992 M101CDN2
https://www.thegearheadproject.com/category/jdm-journeys/