What to seal roof rail weatherstrip channels to roof with.

I removed the stainless u channel that holds the roof rail weatherstrip in place on my 67 notch for a full rotisserie redo. The U channel had some thin foam strip glued to it, between it, and the steel roof rail as a gasket of sorts. Anybody here find a substitute foam strip to use in place of whats there, or use something else. I dont want to glue it in place with silicone if i ever have to take it apart again.

Thanks
Matt