Let me try this again, got bumped off the internet.
Before you invest, look under your Solera. Mine came with a rear sway bar (approx. 1"). I opted for a Hellwig 1 1/2" and replaced the original. It makes a difference as I experienced the west Texas winds in June. I will probably add helper springs as I am usually pulling a small trailer & would like to go up to a covered car trailer for the Hot Rod. I only paid $149.00 for the bar, see this link.
1983-1997 Nissan Pickup & Hardbody 1.5-2 Suspension Kit - 800H / 805H / 810H | $339.95