'83-6 rear lowering springs, ~1.25" drop: $20

these were on my 86 XR7 when I bought it..
drove it that way for couple years, then
I swapped them for some used un-cut stock TC springs..

for sure will work on the '83-6 ; I dunno about the '87-8 ..

msg me yur email addy if you want pix

PS I replaced the squished out OE isolators with:
Energy Suspension Coil Spring Isolators 4.6101G
https://www.summitracing.com/parts/ENS-4-6101G/