Found this on the rear spring...
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From: Milwaukee, Wisconsin
Car: 1987 IROC-Z
Engine: 383 with Edelbrock ProFlow EFI
Transmission: TH350
Axle/Gears: 12 bolt 3.73 Eaton posi
Found this on the rear spring...
This tag was on the drivers side rear spring. I noticed another tag on the passenger rear so I'm assuming it's the same but I haven't looked at the front springs yet. Any way... the tag reads: 10018091 NNL

I was wondering if this signifies that it is a stock spring or not. Any info on it would be great.

I was wondering if this signifies that it is a stock spring or not. Any info on it would be great.
Joined: Aug 1999
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From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
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From: Manchester, CT + Nashua, NH
Car: 90 Firebird Formula
Engine: LO3
Transmission: T5
Axle/Gears: 3.08 one wheel peel
Re: Found this on the rear spring...
Mine had those too, i picked them off to see what they said
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