Threaded alligator clips for insulation tester probes

[malagas_on_fire]

Hi

I bought recently some uni-t probes with screwable M4 in order to add on threaded allligator clips to serve as spare probes for insulation  tester . However i couldn't find properly identical to the original one which is also uni-t .

 Both have no markings of the model.

The best aproach i've got was this "based" fluke AC175:

https://ebay.us/CGG1HK

But either i found the same model on other sellers as snap-on only or threaded snap on. 

The uni-t model for the threaded one is UT-C05A (M4) but didn't find a good price or a local distributor.

https://www.uni-trend.com/html/product/qita/ut-c_alligator_clips/UT-C05A.html

Are there better alternatives to this threaded alligator clips which are compliant for insulation tester up to 1000V? Insulation Tester Model is uni-t ut 501A.