The ones Mustangs Plus sells are prt# 505-7867. They are 4.75" backspacing. I have them on my 66 coupe and I am lowered 1.5" all around. I run 234/45 tires in front and 245/45 in the rear. I did trim the lips because I drive agressively and wanted the extra clearance.
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347 CHP shortblock, TFS TW, Stealth, 650 Holley, Flowtech hdrs, Dr. Gas X, 2 Chmbr Flowmaster, MSD 6AL-Dist.& SS coil, March serpentine pulley system, Richmond 6 spd, CFDF, Hyd. TOB, Currie 9" w/3.50, alum Drv Shft, susp mods, TCP subframes & tower braces, Trans Am Racing power dual master, 4 wheel disc, 17x8 Torqthrust II's
Something up my sleeve 
In a 66 coupe
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