I realize that maybe some of the knock offs might work. The chassis version of the NL4 I got don't! Just the weight of the cords cause them to loose connection. I tried adjusting the metal prongs inside but they just aren't casted correctly. So although they were like a buck a piece, it was a total waste of time and effort. I have to spend hours replacing them all now with the real ones. I should have known better!
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good old Parts Express saved me again!