18BB3309 up for sale is a set of 4 custom made parts that are used in the Taylor large neon thermometer made back in the 1950's , I have seen many restored Taylors that were missing these why skip that step in your restoration its hard to mount the neon and make it fit good and leaving these out makes a restoration look like its missing something as you can see these from the front of the Thermometer , so add these to your parts list and make it complete , these also work good for the person converting that non neon Taylor to the neon version, Note Frame and clip with metal holder , and Vintage neon Thermometer not included in the sale just shown for reference  , also these are just 4 plastic custom machined parts made from the same material as the originals , you have to make the small brass metal clips to hold the neon but this is a thin piece of brass material and can be purchased from a the hardware store and cut and drilled , nice parts for your vintage restoration, these were not cheap to get machined up but they are worth the time a expense to complete a nice restoration,