I got some cheap 16-22mm adaptors from ali express for my DW6900 (imetal adaptors, not the abs plastic).
They are £5 plus vat now, so around £6 per pair.
The 6900 was too bulky and top heavy for a nato, and it ended up on a 22mm shark mesh bracelet. You might be ok with the smaller 5160.
There will be plenty of choice if you convert to 22mm.