[GMCPaul]

If you look closely at the OEM felt installed on your door you can see they trimmed the felt off and that end tucked behind glass run channel ends up getting bent towards the door frame, however if you look in the factory assembly manuals they show the inner felt sitting on top of the glass run channel rather than behind it and again they show the end being bent slightly.
Now why the factory assembly line seemed to place them behind the glass run channel and the assembly manual shows it on top I don't know why.
If you have the assembly manual this area is depicted in the 1st section of the book ( 1967 section as it does not change in later years, if they changed the install in later years then a update id shown in 1 of the later year listings ) just after the depictions of the Suburban door assemblies.
Paul Jr @ GMCPauls