I just finished doing the same thing today, but I got the steel piston ones from Advance Auto. They were $21 each. I asked for 91's and they brought up the steel and phenolic ones so I took the steel one. But get this the core charge was $35, the clerk said they must want the old one back pretty bad. Like you I haven't changed the master cylinder yet, but did put on Power Slot rotors.
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93GT, S-trim (2.95 pulley), SFMU, Stage 2 TFS TW heads, Stage 2 Cobra intake, AFM powerpipe, PRO-M 75mm massair, 75mm throttle body, 42lb.inj. 1 5/8 headers, 2 1/2 h-pipe and exhaust, 2 chamber Flowmasters, 3.55 gears, Ultradyne cam, Elder.timing gears, Black Magic fan, 3 row alum.rad. MSD6al/BTM, MSD coil, MSD shift light, subframe connectors, A-pillar gauges, Pro-5.0 shifter.
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