i bought my T4 V2 from the company that makes them in the states. shipping, "brokerage", and the kit adds up $$$. For what you get, it's coin.
Honestly, in our climate, i feel like it's A LOT of cooling for a motor. if i did it again, i would not buy it again. Instead, i'd use a 36hp on custom tins (upright cooling conversion) with big oil coolers and a CHT gauge.
I run two T4's in my two cars. similar motors both with external 72 row oil coolers. on my bus, i still have the stock T4 cooling system - including the T4 cooler. Both engines are comparable in terms of running temps.
my $0.02