Answering question for Tube shield - for 9-pin miniature, aluminum, multiple colors

Product:
Tube shield - for 9-pin miniature, aluminum, multiple colors

Question:
I just purchased a used krank rev1 head. 3 of the preamp shield/bases are missing. Are these standard or close for all tube amp chassis? I'm hoping they'll be a drop in replacement for my new amp as I already ordered them! Thanks