In case anyone else here is in the market for one of these blocks. Please beware. They are not as advertised. They are indeed G1/8 and NOT the advertised G1/4 standard thread.
Upon measuring they definitely seem to be the G1/8 that liaifat85 guided me to.
I am hoping to alleviate the problem with these…
https://www.jw.com.au/product/bitspower-g1-8-to-ig1-4-adapter-white
That will still work out for my application but if you are relying on them being G1/4 it may not.
Thanks liaifat85 for the tip.