[OM] Vivitar Series I 90/2.5 Macro Adapter - need help

[whunter]

From an owner of such for OM, would appreciate a calipered measurement 
of length.  Acquired a pristine specimen (?Nikon mt?), but must 
exchange/convert to OM fittings.  Without a comparison, uncertain re 
potential issues with the thickness of each ring.  Assume the basic 
Adapter is identical for different mount fittings.  Am I in trouble???
Bill


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