A 91 has the fuel pump relay under the drivers seat, on a 91 the relay under the air meter is for the a/c, 92/93 have 2 relays under the air meter 1 for the a/c and one for the fuel pump
built 8.8 35 spline Moser axles with studs,full spool,456 gears,welded tubes,c-clip eliminators,anti roll kit,adj upper/lowers,welded torque boxes,springs and sub frame connectors.Yes the mustang is 4 lug:D
for a 1993 mustang you need a 1992/1993 computer harness(fuel pump relay is under the air meter)
You could always take the complete dash harness and computer harness from the 91 and install it in the 93
86 to 88 uses a 88 California harness or 89 mass air harness
90 uses a 90 harness
91 uses...