not sure but that's how it seems to me that these parts are pre-fixed before delivery.

I am looking at this item in particular under
"Optional Items
Complete Installation / Fix provisions"

from this link

http://www.azurhelico.com/fiches/fiche350_6.pdf

1 05-25024-B B7163-001-20 Inlet Barrier Filter System, detachable parts
1 05-25024-B B7163-001-10 Inlet Barrier Filter System, fixed provisions


so it would seem that this part is supplied as mostly PRE-fixed rather than as a detachable item

Note that the other parts that are "fixed provision" do NOT have this option of being detachable

1 05-81034-B B2818-100-10 Internal long range fuel tank system, fixed provisions
1 05-85007-B B7321-001-00 Fuel management system (Fuel flow meters)
1 05-93010-A B8544-002-00 Lashing points - 100 kts
Mission Equipment
1 06-11024-B B3274-001-10 Settling protectors, fixed provisions
1 06-21019-D B8512-001-11 External hoist, RH, fixed provisions
1 06-26012-B B8511-002-10 Cargo hook mirrors, fixed provisions
1 06-27028-B B8511-005-10 Cargo hook system, fixed provisions


Also here it would seem that the items that are "fixed provision" are pre-fixed

http://quizlet.com/18691877/dqs-td-flash-cards/
A clean configured aircraft assumes all doors and windows are closed and includes what external configuration?

- Fixed provisions for the External Stores Support System (ESSS)
- Main and tail rotor de-ice systems
- Mounting brackets for IR Jammer and chaff dispenser
- Hover Infrared Suppressor System (HIRSS) with baffles installed
- Wire strike protection system