Saab 99/900 Turbo Inca Ronal Wheel Insert Centres
Replacement Inserts (Centre caps) for the Ronal "Inca" Wheels.
These replace the hard to find originals, slightly tweaked design to make them more printable but look pretty convincing compared to originals..
Cap is a separate part to allow FDM printing. May fit other Ronal wheels.
[update] I've now uploaded an optional cap that has Saab lettering in case you don't have stickers available.