Just buy an OE cooler, Valeo part 816666, cost around £120, give or take £20. A larger cooler will be somewhat wasted since the oil cooler air duct matches the OE radiator. But you might find it hard to separate the pipes from the cooler.
Edited by DaveG (09/05/2018 09:55)
Edit Reason: Prices have gone up...
1996 Portofino 20vt & 2000 Pearl White Plus
1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake