For the record, my old shield which was one of the very first out in the market and is in pristine condition needs to be recertified and the straps rest on the top and wrap around the bottom to be buckled. The new ones have the straps riveted onto the shields body itself and are up to date on the NHRA certification.
I will sell my old one once I remove it this week to those needing safety but not concerned with NHRA certifications.