Possum hollow, m.werks, champion shooter supply, champion choice and others I haven't played with yet sell the bore guide you seek.
In order of my preference:
M.werks - are by far the nicest.
CC - (aluminium version) might be best value.
CSS - (anschutz branded) OK product, but not really worth the extra $ over a PH, imo, unless logo on it means something to you.
PH - is the cheapest and still do the job.
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