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Might help if you state year of car, as there are 2 different types of optis used during lt1 production. shbox.com will have pics of the 2 different drive mechanisms used, on his site.
 

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Global Moderator
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So you need the type 1 opti which is spline drive and non vented, unless you buy a MSD opti, which has venting on the type 1.
 
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