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I have the same issue with a set of 17" Mille Miglia twist replicas. It looks like they are sized for the older, flat center caps. If you push the cap on then, from the back, put a dab of RTV (silicone sealer) under each tang it will hold them in. It's a bit of a mess to clean up when you switch back to the 18's so don't use too much RTV.
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Cogito Ergo Zoom!
I Think, therefore I go fast 
Current Porsches:
2004 Cayenne Turbo
2003 Boxster S
Past Porsches:
1989 911 turbo
1981 911SC
1984 944
1973 914
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