I'm looking to add the small eye bolt to some of my P-H steel bipods - they're very closely based on the Bren bipod, and I have seen shooters here in the UK who have done this in the past

It's this part: https://www.brpguns.com/12-screw-sleeve-bipod-mk-1/

Shown as #12 in the schematic:


Just wondering if anyone on here has done this modification, and if so, did the Parker-Hale nut fit part #12, or will I need to source some #13 nuts to secure it?

Thanks!!