Brand new, never used
I no longer own a Mazda so I have no need for it.
This works for Mazda 1.8 & 2.0 DOHC motors, I believe FSDE, but please confirm for yourself before purchasing.
Dayco Part# 84083 - Camshaft Belt Tensioner, Camshaft Belt Idler, Tensioner Spring
Goes for $108 on Rock-Auto...