Handguard bar end Bolt Size

I have Zeta handguards. I went for a ride New Years Eve, and at some point near the end of the ride one of the bar end bolts vibrated out.

Does anyone know the bolt size off the top of their heads?

I don't have zeta's but both different brands I've had use an M8. one of mine was getting a little stripped out so I ordered some replacements from McMaster Carr before it got to the point I couldn't remove it. Part #FHS1X0880-005M1. they were a hair longer than what came with the guards but that's no biggie. if you want to confirm that's what you need you could take the other side out and go to the hardware store and find an M8 size nut and see if it is correct, or wait and see if someone else on here has Zeta's and knows for sure.

Thanks....I found that too. 8mm....but what about length? I guess anything longer than at least an inch might do. There's no such thing as too long right?

I just went with the 80mm long one, it was a little longer than what I had but I figured too long would still work, too short won't since they didn't have the same length that I already had..