Yup - thought so. The O rings in the original radiators can be replaced. the bloke who did mine ended up only charging the cost of them for the whole job ($40 each !!!!) - still feel ripped off.
Id be going a new one - the reason i didnt was that all the trouble i was having with mine occured between Chrissy and New Year and a couple of days before a month long driving holiday of Tassie. So had little option other than a new jeep one......and only just managed to get that one in time !! A new full metal one will remove any doubt that the bugger works properly.
By the way a new jeep original cost me $700. Sounds like a 'no-brainer' to me