IIRC, for the water pump GMB is a decent aftermarket brand. Otherwise I'd go OEM.

Also be sure you get one with the correct sized rear o-ring (you'll thank me later for that one). GMB ones seem to have the wrong size at least in my experience.

Also change your tensioner, pulleys, other belts & main crank bolt if you don't have the latest version... but you may already know that.

HTH

Off Roader
98 Montero with the Winter Package
89 Montero minty clean and reserved for overlanding trips or Cars and Coffee events
96SR (3.15:1 xcase, 35's) gone to the rust gods
96SR Build Up Thread
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