If you take the fitting to a hydraulic shop they can easily ID it for you. I did have something to assist in working out what size and type of hydraulic fittings were used. I have never understood the BSP standards though. Radiator, you can possibly get it re-cored at a radiator shop. Its worth at least getting them to have a look and quote you. Bobcat mainly use JIC, others use ORFS, some use BSP, its really hard to say without seeing the fitting.
I agree with taking the fitting to a hydraulic shop. They typically have all the tools needed to identify the size and type of fitting. They sometimes even carry parts you can buy on the spot, which can be really handy.
Just had my radiator re-cored a few months back. Definitely worth getting a quote before buying a new one. Saved me a load of money!