Adjustable rockers adjusters problem?..

I got some 273 rockers and ordered some locking adjusters from summit. I've done this before and had no problem. these ones that came seem to be a little bigger and definitely the ball on the end is much bigger... They say they're for hemi and big blocks as well but maybe I have the wrong size here I think there are 3/8 by 20?...

Any help for knowledge on this would be appreciated thank you...