As it is from Rowen no, the Molle locks don't fit on the RC-5 kydex sheath.
The hole spacing is right but the protrusion for the handle gets in the way and won't allow the Molle locks to sit flat enough to work.
But!, it wouldn't be hard at all to use the top hole of the Molle lock on the top hole of the sheath and drill a couple new holes for a bottom screw.
It would just ride kinda high.