What replaces the PAT,3750337 top closet door bracket?
Hello! I do recognize this guide, yes. This is an older assembly that is no longer made, but the good news is that the manufacturer suggests using the 23-093 as a substitute. I know that it looks very different, what with it having a wheel instead of a plastic bracket like your original, but figure that the function of this kind of part isn't all that complex. It's only role is to be a guide, so as long as it can slide along the same track then you should be good to go.
Yes, if you replace one of these then you should probably go ahead and replace both, just to be safe.
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