NEEDED: Shim Kit for 5/8-24 threaded barrel

[Maddox]

Anyone know where I can find a couple shims for a 5/8 - 24 threaded barrel?

The Outside Diameter needs to be 0.75".

I can find plenty that have a OD of 0.85", but I need 0.75".

Thanks

[M16]

https://www.brownells.com/rifle-parts/barrel-parts/rifle-barrel-hardware/washers/shim-kit-for-mounting-flash-suppressors-prod103512.aspx

[Maddox]

I saw that shim kit, but it does not give the outside diameter. Most kits for 308s seem to have a outside diameter of 0.85". I need 0.75". I did email gemtech to get an answer.