I've got the J arms on my '88... I don't believe they've got an adapter mounted. Anyway, there are/were plenty of wipers out there which come with a small hardware kit which includes different mounts for different applications. It's been a little while since I've needed them though so I don't know how readily available they are from local parts stores. I understand though if you're looking to just switch over to something more universally compatible.
I'll look at mine later today and see if they've got a part number on them or something which will be of use.
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