Sorry for the no reply.. I've never seen those ends before. I haven't used a whole lot of test gear from before the 80s-90s (went to trade school for electronics - in 1999).
Is that basically a 1/4" male quick connect inside of a wire cap housing?? Maybe it's 5/16"? I have a tough time with getting a sense of scale.
Is that photo from your specific leads, or did you find it online? The reason I ask is that I wonder if yours are missing or if they are broken or what.
If that's your lead, and there is some kind of problem with it, what's the problem? Maybe yours can be fixed or made into adapters. Say the first foot of cable on your leads is ok, but your probes are somehow messed up. Well, cut your leads, and solder or crimp a female banana jack on the other end, and then plug standard probes into that.
Being a little bit nutty myself, I'd also be opening the meter in hopes of discovering that there is plenty of room to just take the stock jacks out and fit some banana jacks right in the meter to modernize that part of it. I don't expect you to be interested in this option, but it's, well, an option.