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Anyone tried these guys?

https://www.greenon.uk/shop

I haven't, but as posted elsewhere the Forge item seems to be the default choice.

Go with Forge, unless you want to try and share with us your experience.

The Forge kit works but is far from ideal. The cooler is actually mounted in the upside down position. It is also mounted higher up than the OEM one so the oil pump has to work harder.

Care needs to be taken when installing as they can produce a weird harmonic around 1800rpm.

My one also rubbed against the main radiator which then need replacement. Not Forge's fault, just an error by the Indy. The hoses can also chaff against one of the front mounting brackets.

An OEM cooler (or Radtec one) paired with either original hoses or JHM ones is what some good Indy's are recommending these days.

Having said that, my Forge setup has lasted 10 years! Just a bit crusty now....

The Forge kit isn't great as per all of the reasons coffey has outlined above. It certainly isn't the default choice. I would say 75% of people on the FB group and other forums go for Radtec with OE or aftermarket lines.