Well I am currently in the process of gradually redoing my interior on my 180. I have a airtex headliner on order and am currently waiting for my soundex foam, so I can start putting foam back in the ceiling. Well my plane is a 68 28-180 that just has lap belts on all for seats. With the headliner down it would make real easy work of installing some shoulder harnesses on the front seats such as the ones from Alpha Aviation, I am just not real excited about spending another grand on the plane right now, but then again its is a safety thing. Or did I just answer my own question