The 50 oz and 28oz refer to the imbalance in the flywheel. You would need the 50 oz one. I think all the 5.0's since '83(?) have been the 50 oz.
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Good luck!
Brad R.
1992 L.X. 5.0 coupe
MODS: A few little bolt ons 
New Best time ...11.60 @ 128 mph @ 2000+ ft altitude.
Rice Haters Club member #39
Users rides #2542
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