Your best bet is to buy a War Belt where you can bypass the MOLLE and mount the holster directly to the inner belt. Here is a bit more information from our FAQ:
24) How do I mount my holster/mag carriers to MOLLE?
Our gear is designed and built as belt worn concealment wear. We do not make a specific MOLLE attachment.
That said, our customers report good results using 550 Cord, Zip Ties, or even the factory belt loops (when/if they line up, spacing varies upon the item) to lace their gear to a MOLLE platform.