they are 3.5", i'd reccomend either Infinty or Pioneer for vehicle speakers, i have infinity 3.5s in the dash and Pioneer 6"s in the doors and 6x9's in the rear, (had to modify the existing 5x7" holes) my system really screams though
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88 Notchback 5.0, 3.73's, pulleys, BBK headers, off-road H-pipe, flowmasters, subframe connectors, 65mm TB, shift kit, March ram air kit, motorsport wires, MSD coil, upper and lower control arms, 155lph fuel pump, cheap 2800 stall, Crane Adj.FPR, best time- 13.99@99.75, not yet tested times after 1.7RR install
