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IPNZ,
You have already received great info from everyone, so not a lot to add.
Since all the 73's now had the federally mandated EGR system, the California emissions option was basically a California calibrated carburetor and distributor. Everything else under the hood was basically the same as the 49 State vehicles were equipped. Of course you also received the nice window compliance decal for your trouble.
The deluxe seat belt option was a stand alone option (standard on verts) which included color keyed belt fabric, chrome buckles and upgraded release button appliques on some models. It also included a circular belt warning lamp on the left lower section of the dashboard. The 71's and 72's built up until 12/1/71 had this system. Several safety and emissions related laws were taking effect the 1st of January 1972. So starting 12/1/71 Ford starting producing all 72 cars with the new Federally mandated belt warning system with a passenger side mounted warning lamp and buzzer system. This system remained unchanged for the 73 production year. The deluxe seat belt option remained but only included the upgraded belts since the lamp/ buzzer system was now standard on all car lines.
Are the belts you posted a picture of some that you are considering buying or already have? The part number on the box indicates a seat belt assembly for a 72 Maverick built before 12/1/71. So those should not have any of the electrical wire/connectors for the warning system. If just using for the shoulder harness should be about the same as the Mustang since the mounting point in the roof and distance to the lap belt should be close to the same dimension for both cars.
Hi Steve, yes all 4 lap belts were still intact on my car. I just needed to source the matching ginger shoulder belts. You are correct, the belt assy in the picture was not specifically for a mustang however, the shoulder belts that came with it are identical to some black mustang shoulder belts that I had laying around.
i saw the USAF wings in your sig. You Air Force?
Paul