Now I need Anti-Tamper Caps

I got a permit for my addition and the inspector says the code requires me to install anti-tamper caps on my Mini-split. Does anyone know where I can purchase these online? I found some but they don't say if they are 1/4 or 5/16. The LG Mini-Split I have uses a 5/16 thread..

Any links or part numbers that folks have would be much appreciated..

Thanks,

Jeff