It is very easy to confuse the sides because of the rear view thing.
Note that pin 34 (ground) should be used, and pin 1 not used, this is an easy way to find the right side.
Also many NIM power supplies do not even provide the 6V, so it is unlikely for a module to need that.
You can see the pinout here:
By the way this is the website of Syd Levine, who has been a wonderful contributor on these lists in the past and would help you for sure if he was still around. I have often referred to his website since he passed away, Syd still keeps on giving.
ST