CHP Spotlight

[NYSSP F]

I have a 1991 NYSP SSP. Unbeknownst to me, it has a CHP spotlight on it which was installed by the previous owner to fill the void where NYSP removed the one they had while in service. I was made aware it was a brass 2 wire CHP only Unity S6 and that it is rare. My question here is two fold: 1- what is the correct spotlight for my vehicle? I have seen photos of NYSP's with and without spotlights and the ones with seem to have chrome spotlight buckets, and 2-what is a used CHP spotlight worth? It is in good condition as far as there is no damage but the handle is missing an end cap. It is not mint but it is in decent condition. I have someone who wants it for their CHP and told me I could basically name my price but I want to be fair to both of us. Thank you. for the info.