Hanchey Vehicle Technologies (previously AST USA) is the original supplier for Xidas 1 and 2s to 949 racing. These have high speed and low speed adjustments, JRI bodies with custom valving for track Miatas.
These have Sub 5k miles, 5 events on a 99, 4 on an Exocet
Asking $2500. $4k new
Comes with 500/300 (100/0 helpers) springs. For $250 more you can have any main spring combination you want including the 500/300 on them now.

Edit, wrong part number in title. Correct is 6216i