Yes, it’s a separate plate that appears to be spot welded on the left end. I can’t get my old face close enough to see the weld on the other end.

1957 Chevy 3200
Daily Driver
PS, A/C, Tilt column, Rebuilt 350, Rebuilt TH350, Reupholstered Bench Seat, sound proof/insulated, LED headlights/taillights/backup lights/interior courtesy lights.
Follow in the DITY