I don't remember the correct o-rings, but to mount a later oil heat exchanger on a very early M96 you need an adapter plate like this:
https://www.pelicanparts.com/More_Info/99610712900.htm?pn=996-107-129-00-OEM&fs=0
or this: https://www.rosepassion.com/en/parts-porsche-boxster-986-2000-eu-boxster-s-3-2-cabrio-manual-gearbox-6-speed/engine-and-fuel-feed-36/engine-lubrication-oil-cooling-68/intermediate-plate-69-614-57252
Try contacting one of those vendors and asking for the correct o-rings to use with that. I'm pretty sure that the top side uses the standard later model parts, but not sure about the bottom. Maybe I'll find my old invoice in email.
Here's a couple pics from when I was playing with that stuff:
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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