6 o'clock MLOK rail for the 20...

Context: I switch between 7.62 and 6.5 Creedmoor barrels on the 20, and lengths within each caliber. I like the PMM MLOK rails, but he doesn't sell the 6 o'clock rail by itself and i don't want to buy lower and side rails for each assembly when i only need the lower rail.

Question: Does anyone know of a PNM-quality 6 o'clock MLOK rail outside of PMM?

Thanks!