Nice choice! These newer electos come with nice graphtek nuts, but it still may require some gentle and not-so-gentle filing to keep the strings from binding when you use the bigsby, And yeah, the plastic pickup rings are definitely more classic gretsch than the metal ones. With your stock rings you’ll need an adapter to attach to the side with 2 screws. TV Jones makes some, but you can make your own. That’s what I did when I added some to my 5420T.