Are there standard spacers folks are using with modern Porsche rims on their 914 widebody?

I was looking at purchasing Cup II wheels (17X7 & 9) and typically the offsets are et55. Most Cup I and Turbo Twists are the same as well.

Also I've seen Cup II replicas made by Mille Miglia that have offsets of et23/et15. Seems like spacers are unneeded in other applications with these offsets but I haven't seen anyone use them on a 914. Anyone currently running these?