Oh lord no..
They are 6x8 (5x7) all the way around 99-04.
__________________ Block .20 Bore 3.830, ARP Head Studs, Ford Girdle, Scat 4340 Forged 6.125" H-Beam with Ross Forged Dished Pistons 8:7:1 compression, KPP Cam Reground 224* .587" Intake / 222* .567" Exhaust 114 LCA, 110 IC, Self Ported Heads with Self Ported Upper intake ported lower intake with a matching ported throttle, Mac long tube headers, Flow master 40 series mufflers, 3.73 motive gears, Eaton posi trac, Sct livewire, Bilstien shocks and struts, Eibach pro kit springs. FS: POLISHED VORTECH V2 3.8L KIT
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Who knows what size are the speakers for a 1999 Mustang 
