Masthead Trilight/Anchor combination

After a bouncy crossing of Georgia Strait I noticed the tri-light section of the masthead nav/anchor light was canted forward.  It's 15 years since my last nervous making trip up the mast so I contacted a rigger to go up and make the necessary repair.  We picked up an Aqua Signal series 40 fitting to replace the broken unit.  The quickly discovered fault was the anchor light section of the lens had cracked and broken after  25 years of UV exposure.  I'm posting this as a cautionary note to let you know that the lens assembly is available separately rather than buying the whole lamp.