I have a few sets of the CEP 203 TTC. Installation instructions will be emailed if required.For the Military or Aviation collector. Thanks for your time and once again please do not hesitate to ask questions. The item "GENTEX HGU56 PILOT FLIGHT HELMET CEP203 TTC HEAR TALK THROUGH KIT CEP508 C16" is in sale since Tuesday, March 23, 2021. This item is in the category "Collectibles\Militaria\Surplus\Hats & Helmets". The seller is "tolly4" and is located in Gilroy, California. This item can be shipped worldwide.