Lap Belts for my Dart

I am looking for a pair of lap belts (seat belts) for my 69 Dodge Dart project. These are the belts that mount on the inside floor next to the front bucket seats. I have a pair of brand new belts that include the double buckle for connecting to the shoulder belts that mount over the door as well as the retractable lap belt, but my ride will not have shoulder belts when I am done. Looking for black belts in very good to excellent condition. If you have a pair or know of a place that sells them, please let me know. Thanks.