HarleyDavidson Softail,FLSTB,FLSTC 20082013 Studded Tank BibStuds,No Conchos. Mustang Tank Bibs are handmade at the Mustang seat plant in New England. They are available plain or with studs and a concho. Tank bibs are contour formed to hug the tank and feltbacked to protect the paint. These bibs utilize stock mounts for easy installation.