Remove your ZR-2 flares?? You'd be tar'd and feathered over at ZR2usa. Are you on crack?
The front fenders you'd be better off replacing completely (You could actually get a good chunk of $ out of selling intact flares). The rear flares will leave holes and a big lip on the bottom of the fender. Even if you weld the holes up and cut the lip off it still won't have the same contour as a regular Blazer.
You could go prerunner fenders on the front... But I've never been a big fan of that. One guy over at ZR2usa had them and I thought they looked funky on his BlaZeR2.
Or if you're lucky... Find you a set of LS1 flares from Diversified...
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