Are Porsche Center Caps a Universal Fit?

[dja1980]

I purchased a set of colored Porsche center caps from eBay this morning, and I want to make sure that these will fit my wheels before they ship.

I don't have the car with me today, so I can't verify the shape or size of the black/silver caps that are currently on the car.

I have the 18" Turbo Look wheels.

The part# for the caps I ordered is 993 361 303 09.

I believe I read somewhere else that these are the "cupped" design.

The auction states that these caps will fit 993/996/968/994, but the Boxster is not listed.

Are these the caps that are designed to fit my wheels?

Auction Link