Need help with O2 Sensors on 95 GT

[Mike Souslin]

My neighbor bought a 95 GT Vert and It was running pretty poorly so I decided to help her out and do a tune up on her car. The first thing I found was that the car had the wrong spark plugs in it. I mean that these things stuck into the combustion chamber almost 1/2". (I screwed them in to my old cylinder heads to see how bad it was. I can't believe that they did not hit the pistons!!!)
Anyway, I put the correct plugs, cap, rotor, wires and fuel filter in her car with great results. The problem is that I suggested that she get new 02 sensors because the car has almost 60,000 but the parts store said that the 95's have 4 02 sensors. Can anyone verify this???? My 91 has 2.
Thanks.

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91 Coupe with fresh rebuild. Running Stage 2 Avenger heads (51cc chambers), Stage 2 cam (.549, .566)1.7 Crane Gold Race rockers, Port matched GT-40 upper & lower, 75mm Bullet MAF, 65mm Accufab TB, MSD 6AL, Long Tubes through off road and Dynomax muffs. Stock T-5 and 3.73 gears. Big Blue Bottle on it's way!!!
Best time so far = 60'=2.021, 1/8=8.366 at 86.37 mph and the 1/4 was 12.926 at 108.94mph.