I have one tail light with a bullet and one with a reflector. I thought a clear bullet light would make a cool backup light.
Found these on Amazon, most of the torpedo style lights I've found are double the size, but these have that kind of a crystal look like old dresser knobs. https://www.amazon.com/dp/B0F32TQK6D/?tag=atomicindus08-20
^^^ ^^^ I was looking at these yesterday for a project on my 31' Tudor but I wish it listed the overall diameter of the light. I chased down the same light on other sites and the only measurements I could find was it takes a 3/4" mounting hole.... .....
If you look through the pics in the link it gives the overall dims. The ring is 1" od, 1" tall overall
I used two of these for glove box lighting. They work well for that, but don't know if they'd be enough for backup lights.
I was looking to use them as front turn signals on the bicycle fenders on the front... Wasn't sure how bright they'd be... @topher5150 thank you for the information!! Somehow I missed it... ...