I'm in contact with EngineTech who are a source for Montero lash adjusters. They're checkin to see if they can confirm the ones they supply are the larger bore or not.

In the meantime they sent me a picture of their adjuster with the bore diameter noted. If anyone has an old OEM adjuster laying around maybe you can measure the bore diameter so I can compare it.

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92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles