[AlanM]

Pedders make replacement rear springs and shocks that replace the Nivomats.

The springs are about $300 the pair, the shocks $350. Fairly steep, but much cheaper than Ford shocks.

I replaced the original self levelling shocks with ordinary KYB gas shocks, but the rear end definitely rides lower. (One of the original shocks was still good, and was obviously holding the rear up a fair bit.)

I'll probably fit airbags, since they cost about the same as springs but have adjustability to suit various loads.