Found these among "stuff" I got with my first car, I have a V6 4 speed.... I dont think both would work on it, the connection point for the slave cylinder is in different places.
Im assuming one is for a 5 speed?

Early Fieros used the stamped steel arm, the cast arm came along mid 86 to solve the flexing issue of the stamped unit.

My '86 coupe originally had the stamped arm. When it broke, I replaced it with the cast one. I had to make a slightly longer pushrod to get complete disengagement of the clutch.

That said, the cast arm is more reliable than the stamped arm. So IMO, the swap is worth the extra effort.

The one on the right looks exactly like the one that was on my '85 GT 4 speed when I bought it, although the part where the slave pushrod connects didn't look as nice.

There is even another one, there are 2 different cast ones, the 5 speed and a replacement 4 speed one.

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The stamped levers also had problems with the splined areas stripping...this very problem cost me $3500 for a full clutch replacement in my first 85 SE. Dealer policy was to replace everything.
I would recommend not using the stamped levers at all, & if you already have one, make sure the clamp bolt stays tight.