About to order up a radiator [2001 Disco 2] and im seeing the options for sensor hole or no sensor hole. And also for secondary air which i do not have. But all the stock photos look the same between various websites and part numbers when cross checked are the same for SA and non SA.
Looking to place the order off rock auto since they seem to get me my stuff quickly. Specifically the nissens rad they have if its the correct one?
I have 0 working knowledge of the SA system to differentiate the rads if thats even a factor for a 2001.

 

Watch this video - may help you -
Courtesy of Lucky8.

 

Wow. Explained in 15 seconds flat. Missed that video somehow. Thanks for the link.