Bought these 3 years ago. 12v, fit perfectly in the hole, fit flush with ceiling, dimmable, no heat. No problems in 3 years.
https://www.amazon.com/acegoo-Recessed-Ceiling-Aluminum-Downlights/dp/B012ZOI44C/ref=sr_1_11?crid=1QQNVFU0PMLKV&keywords=12v+led+light&qid=1584666555&sprefix=12v+led+%2Caps%2C221&sr=8-11