Question about installing 68 trim on a 67 Cuda windshield

mopar head said
Seals/ gaskets are going to be different. 67=lockstrip 68-9 not. afaik

I got new 68 gasket seals. I'm asking if I have this installed tomorrow. When I have the glass removed to do the headliner will I need new front and rear gasket seals or will they be reusable in 6 months?