someone suggested see if I can pout distilled water in them, and it does flow in, i installed it anyway because need truck to work.
Some of the high end 3 layer all-aluminum ones on ebay (around $150, I got the $75 one but the $75 worked fine on my old 2000 ranger installed in about an hour no problem), second to last pic you can almost see what looks like the same honeycomb type thing in the hole.
https://www.ebay.com/itm/19489610194...Bk9SR5T1osirYQ
But it doesn't matter now because now I have to run to autozone and pay $215 for theirs because these two fittings cross threaded my damn transmission lines! The first bottom one seemed to go in ok , total PITA to work in that tight area and of course the line wanted to twist with the nut when starting to remove, then the top one I noticed was cross threading, so I installed one of the two sets of adapters and it seemed to fit fine, then added a gallon of coolant and turned truck on with heater on ready to fill to top and noticed the lower transmission line was leaking bad, so now I'm just going to buy the autozone one. IDK how the preinstalled fitting would cross thread, i've installed tens/hundreds of thousands of bolts professionally etc and it seemed to be going fine but the stock fitting cross threaded and the only other adapter that was even close also cross threaded.
Might see if I can take these fittings off my old radiator, if not will buy AZ radiator.