I forgot to list the neck size,but it said 1 3/8", so it's SR size. And yes, a radiator thread would be awesome. I'm thinking about getting one of these Godspeed ones for my car. Looks pretty decent. During my search I also found that same radiator with a dual slim fan combo for $180, that's not a bad deal either. I just searched for "radiator" and narrowed the search results to Sentra, and NX