This is a special US plug for use that comes in handy for cars fitted with hedders or other space restrictive systems... where a performance plug is need to the normal GM Spark Plug. These are a specific well known US performance plug.
SUPPLIED EACH
The difference is a measured here.. 10mm betweek the hex hut head and the top of the plug as illustrated.
This units fits the cars listed below.
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85-87 Camaro - Tuned Port Injection both 305 & 350.
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85-87 Firebird Trans Am - Tuned Port Injection both 305 & 350.
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85-87 Corvette - Tuned Port Injection both 305 & 350.