>>1791515ok i found it, i saw these before but it didn't click with me until i after i had examined the markings etc. it came with a crown race marked "373 AL 7075 o 39.8" so that confirms the neco connection even though the neco website says IS52.2 for some reason and doesn't show a pic with the larger chamfer. kinda annoying that it seems to be a bit of an oddball size so that i might not be able to find a stainless steel upgrade or dirt cheap replacements.
https://www.aliexpress.com/item/32991572902.htmlhttps://www.aliexpress.com/item/1005003717636930.htmlhttps://www.aliexpress.com/item/4000863525246.html 