My 99 Ram 1500 van transmission cooling lines are leaking at the fittings at the bottom of the radiator. It appears that the two fittings in the bottom tank of the radiator itself have thread damage. When I try to loosen the large nut on the fitting I start to get radiator coolant leaking out. What I'm not sure of is if I can replace these fittings. I didn't want to drain the radiator until I know. I have the factory service manual and on page 7-32 figure 44 shows the radiator with the coolant lines and the two fittings in question but that's all I can find. Are these replaceable?

Thanks,
M. Wagner