1/4 inverted flare to AN fitting? Does it exist? Trans cooling line issues

AN fittings are all new to me so please bare with me.

I am trying to route some trans cooling lines to an aluminum radiator I picked up. For the radiator I have, on summit's website it states..

"Cooler bosses fitted with 1/4 NPT fittings"

When I look at the radiator they are female inverted flare fittings though. I have a hard line with inverted flare fittings that threads in there just fine, but I am looking to convert it to an AN fitting so I can run some Aeroquip lines. etc. I can't seem to find a true 1/4 inverted flare to AN fitting.. do they exist?

I tried this fitting.. it threads in a couple turns then gets tight?? Should I be using this and just tighten it up.. Just doesn't seem right.
http://www.summitracing.com/parts/SUM-220651/


So I am confused and not sure whats my best solution at this point.. HELP

Radiator link
http://www.summitracing.com/parts/SUM-380459/


Thanks Bryan