Radiator

[94 formula]

I just got done with opti, plugs, wires, and intake after my car overheating. I also gutted the cat cause it was probably plugged. When I started the car and it got warm it started squirting out antifreeze from the plastic part right below the radiator cap. Is it possible to just get the new plastic part or do I have to get the whole radiator. Its a decent sized crack so I don't think its repairable. Also could I put a radiator on from any year Lt1 or just from 94.