Moderator Help - .357

I am getting a .357 barrel for my Leshiy 2 but stuck on how I am going to moderate it. Since it's going into the L2 it's a 14mm diameter which means it's threaded in M14x1.25. I don't see any moderators in .357 that come with M14 threads. Seems most options are M20x1.

Anyone know of a .357 moderator brand that will come with a M14 thread?

Or, is there a M14 to M20 adapter out there I could use?