Went to Ace Hardware and bought assorted sizes of M5x.8 Allen head screws... to go with a rare 20 year old NIB Nardi/Personal steering wheel I picked up recently.
The horn button was lost, so I had to source a period correct Personal one from another source... until that shows up, it has my old school Nismo horn button on it.
Edit, the period correct Personal one came in... Not sure which I like with this wheel. Here it is along with second pic of my 80's OEM Nissan horn button.