I've used 2 Be Cool radiators. both of them in 440 darts. I've been very happy with both and they are bolt in units. You can buy one that will reatain the battery. The other requires relocating it to the trunk.
Get an aluminum whatever you do. Also, this is an area you don't want to skimp. Cooling is everything.
I strongly agree,go alum and you will not regret it...many ways to go here and many price ranges,just be sure of your fitament and hose size/locations....you want to get it right the 1st time and spend the coinage just 1 time....