Seat Identification: '73 or '74?

Funny you mention that because my instrument cluster has a Seatbelt light as well. This car is literally an oddball, man. I’ve been trying to figure it out for ten years now. Lol ‘74 VIN, ‘73 50/50 bench, and a ‘75 Seat Belt system. Sheesh.

Long story short, where should I get my upholstery? Any good recommendations?
72/73 DART/DART SPORT/DEMON/ DUSTER SRM BLUE CLOTH/BR BLUE | Legendary Auto Interiors
Play around on their site, there's more options available!