Ah, I didn't know that Z1 carried those.
I was going to order on vintage connections since I want to pretty much replace all of them on both of the 350's and I don't like the ones I bought locally. I'll save those for other stuff. If I get sets of 100, I'll be good for a while. I think we need the 4mm or is the 3.5mm correct? Any one know?
FYI- The "modern" ones for 14-16ga will usually push in and expand the female end just a bit if you give it a little nudge.