I saw a guy on YT who got some base s550 seats in a fox body so they should fit fine in a new edge (with drilling to adapt seat brackets). The downside is weight. The drivers seat is close to 50 pounds vs a racing seat like recaro, Sparco, corbeau, which are 20-30 pounds each.
'01 Mustang GT 5M
Drivetrain:Steeda,Dragon,Accufab,SLP LMII,Magna X,Triax,3.73,PBR/Stoptech/Porterfield,Alum DS
Suspension:MM C/O F 350#,Griggs SFC,MM LCAs,FRPP UCA,MM PHB,Mach1 STB,Prothane SB Bushing,18X9 03 Cobra