This is a .75mm shim washer for use between the rear control arm and body mounts for Fiat Bertone X1/9 and Lancia Scorpion. One or more required per side, dependent on individual fittment of control arm and wheel to your car. 14mm ID / 35mm OD.
Either Original Equipment New Old Stock as supplies permit, or used units that have been freshly media blasted and yellow zinc plated. Like new.