Thanks Dart, for the follow up. Apparently you didn't, but debating having an internal spring compressor handy. Anyone know if Autozone has the correct one for a 'loaner"? No work out there in the cold season, but might as well shop for the Aerostar CC850 springs and get them ordered. My first look saw that the price does fluctuate just a bit, with free shipping. Another item in the to-do pile. Keep the comments coming.
edit: do shop, quite a difference in prices. Checked again this morning, and found Rock Auto with the best deal. Lowest price, with fast shipping, can get them here for $53.
edit 2: people are calling these progressive springs. The product description says different.
CC850 - Variable Pitch Spring; Sold In Pairs
Moog offers two types of coil springs: constant-rate springs that restore handling to its original state, and cargo-coil, variable-rate springs as an upgrade for vehicles that carry heavy loads. Moog's constant-rate springs are built to replace original equipment springs, returning ride height and body sway to original performance levels. Replacing worn coil springs with Moog constant-rate springs restores vehicle handling. The cargo-coil, variable-rate springs change resistance as they compress and become progressively stiffer as the load increases.