They are called spigots. I believe they are 52mm from memory (but could be 57mm). If the spigot holes on your wheels are to big you can get adaptors (spigot rings) to bring the size down. If they are smaller then you can have the wheel machined to enlarge.
The critical point is the at the spigot and spigo hole size must match. If the hole is too big you will have very bad problems. The car will be undrivable and unsafe
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