I picked up a set at the junk yard (They were in a pile of wheels) i dont know what car they came off of i thought i read some where the fiero and the other pontiac cars had a diff off set on the 14" tech wheels

I don't know of any distinguishing marking so I would just suggest using a board (2x4) and a ruler. I think the offset on those 14" wheels is 35 mm. That would mean the distance between the mounting surface and the back of the wheel is 111.2 mm, or 4 3/8 inches. The distance between the inside of the mounting surface and the plain of wheel face should then be 1 5/8 inches since the wheel is 6" wide.
I may just be stating the obvious but I've recently gone over the offset calculations so I had the numbers on hand. No insult intended.

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1988 Fiero Duke Coupe
Soon to come: 16" rims (next month) and a ZZ4 SBC (next fall)

What you are looking for is a lip on the outside of the wheel......the Fiero has this lip while the Grand Am, etc. did not (it was flush).

Grand Am 14" hi-tecks will fit the Fiero, but will look wrong (missing that all important lip).

i think the correct wheels for the fiero have the one inch lip on the outside diameter like on the rear of the 88 GT lace wheels

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1986 GT 4spd> Suspension Techniques Springs, Poly Bushings, Bosal Brospeed 4.5" Exhaust Tips, Cross Drilled Rotors

Fiero wheels have about 1/2" lip; Grand Am wheels are nearly flush. I have a pair of Grand Am wheels with "48JJ" cast into one of the spokes inside the wheel; I think this indicates 48mm offset.

Grand Am wheels work fine on the front of my '85; they reduce scrub radius and lighten steering.

Heres some info from the Fiero Secrets page on this topic plus the link to the home page. http://www.skperformance.com/5_lug_bolt_patterns.htm#5-100%20mm. http://www.usacomp.com/Offset.htm
and Paul McKibben's home page http://www.angelfire.com/biz/fierosails/

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Notchbacks Rule
84 Coupe(project car)
85GT(show car)
86???(looking)
87SE (daily driver)
88Coupe (daily driver)