I found the neutral safety switch assembly on AC Direct for my car, although it gives two different part numbers, one of which costs $20 more than the other.

Here they are:

ACD# D2234
ACD# D2234A

The "A" one is more expensive, what does it mean and why? Which one do I need? Thanks guys.

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1990 IROC 350
Mods: Too busy trying to make it run right to mod it.
Airfoil, Dynomax cat-back, MSD coil, 180 t-stat, Bald Eagle tires,
Hypertech fan switch, Accel 23# injectors, Holley module, ported plenum,
Ported Daytona Yellow stock base, Moroso valve covers, other stuff,
Streetdampr, Ruger P95DC, hot wife, new oil filter, !cats, !TBC, !AIR.
18.0 @ 85MPH since I'm one big-a$$ MF
"It's better to have and not need than to need and not have."

 

I do not know anything about AC Direct, but if you can cross reference it with a GM part number, it is 1994223.

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1989 IROC-Z 5.7L
NOS 5151 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System