WANTED New Heavy Duty Radiator.

HELP.
My Gu 2003 keeps on overheating when Im towing.
All I want is to start from scratch and replace my Radiator with new. then ill follow up with new hoses, thermostat, etc etc.

ive searched and so far have discovered 2 radiators that might suit.
one is from Aussie coolers which I think use chinese cores and the other is from Power radiators which I believe are aussie made.

any updated info or better quality ones that are straight bolt on would be great.

prefer the aluminium ones

What engine is it fir and where are you located ive got a zd30 aluminum/ plastic tanks only done 1000ks $120 pick up melbourne