does the bolt from your old forks fit?
i found this out the long way too.... you don't actually need the bolt formally known as the hollow stem bolt. this is now called a fork bolt i believe...
all that bolt does is holds your stem down before you tighten it. once your stem is tightened, then you can take the bolt off and stick it back on your old forks. but not all bolts will fit all size forks. but you can buy these bolts seperately.