Wheel Adapters/Oversize Rim Fitment

[Gilles]

Have you consider using OEM 18" Cayman wheels?

These would fit perfect, are strong and fairly lightweight (...BTW affordable too)

These show up from time to time here and also on the Planet 9 forum, and you should find a nice set for less than $1k

To make the wheels flush, you can use spacers (with longer lugs).

Good luck!