In order to put the DC radiator into the EG you will have to get a chiesel or similar cutting tool and cup off all of the lower radiator and a/c condensor mounting brackets.
You have to be careful removing the 2 radiator bracket ones because you will have to re-use them. Now take a good hard look at where you want to put the DC radiator and mark the heaght you want it to sit at etc. Make sure you have clearance for the hood.
Measure the distance from in to pin on the bottom of the integra radiator (I think it's 22 inches but make sure you check it)
CEnter the 2 mounts and weld them inmaking sure they go in the same direction they came out.
Now for the top you have a couple options, you can either use OEM integra mounting brackets or you can make your own, the old civic bracket will not work
You have to line up the brackets making sure there is room between the top of the radiator and the support (otherwiss it may rub and damage the radiator) and then use self tapping screws to attach the brackets (unles you have a riv-nut gun)