Open System Engine Cooling Convertion Question

i have a 90 xj and the previous owner put a later style radiator in. my ? is what type of over flow container is used. and pix if you've done it plz

thanks mike

Most folks just use a stock one from an xj that already had the open cooling system.

Just go to any local parts house and get one that will fit , most people mount them to the plate in the back where the old style bottle was.