Whilst looking thru the Sept. issue of Just Cars, on page 127, there's an ad from the distributers of Kendall Motor Oil. They say they are carrying a line of aluminium radiators that are a direct bolt in, including trans cooler, for many cars, including Mustang.
The 3 row is $495 and the 4 row is $595.
They're in Sydney and their ph no. is 9477 7666.
As far as Flex a lite is concerned, they're an American co. that's been around for probably 50 years, if not longer.