I don't have any parts lists laid out if that's what you're asking for and I don't know of anyone who has a full kit available. I've always gone with -10AN or 1/2" NPT (1/2" NPT is larger than -8 but smaller than -10AN). For the filter head I recommend getting one which enters and exits straight out the top (so the oil doesn't have to turn 90?), avoid 90? bends and fittings where possible. Use a thermostat. -8AN isn't terrible but given how far you're going to be diverting the oil I wouldn't use it if you're installing a full flow setup... I should have asked that first I guess: Are you installing a full flow system?
I would be interested to see how an oil cooler off of a 3S/5S engine would perform on the MKIII. You'd probably want it installed as a bypass cooler (kind of how the stock 7M-GTE's is plumbed) and could probably skip the thermostat. It's a water cooled setup.
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