Why do VW and Bentley recommend replacing the heat exchanger any time you have the motor apart?
Even the $360 OEM unit was leak prone 3 ways form Sunday, but the cheap knock offs are cheaper.
I paid about $60 to remove that stinking thing from my engine bay.
If you need a bolt, you can get one from any Volvo or VAG car at the scrapyard with a similar cooler.
The tube for the oil cooler is a different diameter than the used for the fuel filter...the Eurospec adapter solves that issue if you want to use a stock fuel filter. if you have a 3/4 16m fuel filter assembly you can use a Baldwin fuel filter. i believe this was the setup used by Frybrid, which had a very good reputation for reliability (the owner not so much).
i guess VW was thinking about warming/cooling motor oil not vegetable oil when they recommended replacement intervals

i paid about $60.00 when i installed my oil cooler to my NA; people look at things the way they do.