Mamiya RB and RZ 75mm/4.5 shift lens, or the RZ SB 75mm lens---FRONT GLASS ELEMENT.  This is a brand new part for replacement if the front glass element in your RB or RZ shift lens needs to be replaced.  This is a Mamiya factory brand new spare part (NOT a salvaged glass element from used lenses).  The glass element is crystal clean and no problems whatsoever.  For the RB or RZ 75mm/4.5 shift lens or RZ SB 75mm lenses only, (NOT for the RB KL 75mm and RZ 75mm non-shift lenses).