Steering UJ

So some spirited driving in the snow has had a detrimental effect on my universal joint, ok no problem I can easily sort that, WRONG, I can only find 1 joint for sale anywhere and there is two different ones on the column.....
Can anyone give me a solution of where to find the two? I can't just wobble the steery wheel and look at the joints to see which is the dodgy one.....

put you phone on video in the engine bay then wobble the steering , then watch the video may take a few goes but you will get there

Yep, obvious idea that hadn't occurred to me
I would still like to know if both UJ are available though

The upper side is not available as spare