Is this the pull handle you close the door with? Or the flipper handle you use to open the door with from the inside?

The pull handle should be similar for custom or standard, in which it should have two philips screws that attach it to a metal plate and the door body itself.

Now, on the door flipper/handle to open the door with (mine is standard) I think I remember there being a single screw or bolt undernieth or center? Perhaps under a center cap?

Been quite a while since I had a 67 with custom/deluxe interior...

Maybe Carlos or Gary, or someone with custom interior can double check and chime in?

Welcome to the group!

Brett - 67 Drop Top 455!