Product review (5 stars): Swamp Cooler Bore Spide Bearing replacements
I am very pleased with this product.  The chore was getting the old one off, as it had seized and had to be sawed off the shaft.  Once that was done, the new one slid right on and the job was done fast.
I haven't used the cooler too much, but enough to know that it is working well and the noisy bearing problem is gone.
I recommend this product to everyone whose cooler requires this type of bearing assembly.