As I mentioned
here, I acquired some Speedline's that had the classic cracking of the aluminum inserts. A friend of mine discovered that the '95+ Ferrari F355 also had magnesium Speedline's from the factory that used the same inserts as the Saleen model wheel (Speedline 1908).
StickyRX sells their version of 23mm insert that the Saleen wheels used. They also modified them to resist cracking by removing the upper lip of the insert.
We used a hammer and a socket to pound out the old ones and a hydraulic press to install the new ones. So far they're holding up.
