That helps, that's the first thing I have seen that shows anything about the sensor, thanks.

 

I see on the chevy parts link above that they list the radiator for the gvrw15k van way cheaper than that of the lighter van. but no mention based on vin of which radiator is is used.
Still no definitive answer.
Seems you just have to take the SOB out and find out... THEN go see if the stores even have your part.
It is very frustraring with parts from advance at 450 and Amazon at 99. 2 days of research and I still dont know whether there is an actual quality benefit.
AutoZone who I used to avoid like plague has dramas at 235 W/O sensor, 320 with. But they tell you nothing of "rows", or quality differences.
Ive never dealt with the type of intermittent leakage im having here so I might be back into it after I find my radiator anyway.

 

doing a swap in mine right now.since I'm going to electric fans I had same problem. Found double row,all aluminum one with threaded overflow here I can tee in sensor. $160
https://www.speedwaymotors.com/Speed...?sku=917347-31