Euro spec Z32's that came with a larger cooler assembly. Everything else in the cooling system is identical between Euro spec and other markets. Considering this I think Nissan only included it with USDM/JDM cars to help keep oil in the smaller cooler a little longer. The euro spec cooler is huge and was sold here in the US by vendors as the nismo cooler. The entire euro spec cooler kit is NLA from Nissan but the assembly itself is still available. The assembly is also used on some Nissan forklifts.