This is a great example of why I don’t like buying used stuff anymore. Some yobo installed these rails with self tapping screws, some of which were missing threads. There were plenty of shavings in the seats from where threads used to be. These will need drilled and tapped, with grade 8 hardware installed, for safe use. Those Recaros started looking good again, as they will bolt directly to the Recaro Japanese rails I ordered for her car. Boy oh boy.