ACOG flip caps for 4x32

Does anyone know where I might be able to pick up a set of the RCO clip caps that’s on the ACOG M150? I think the parts numbers are TA91 for the RCO killflash and TA94 for the cap, but I can’t find a retailer that carries them.

I’m referring to the caps and killflash in this pic:

I bought mine directly from Trijicon. Took a week to get here.