I have to agree with norbs. These are your brakes, not a place to skimp with used or questionable parts. Hank Terry has brand new units for quite the reasonable price. Look how long the roiginal one lasted, his will last just as long if not longer because you will take care of it better than your average auto owner.
The JBWeld my get you buy, but you should consider getting a new one...while they are still available.