Originally Posted by
Jaytron
I may have to get a newer fork, since I'm having trouble finding a 21.1mm quill stem with a shorter extension.
This is a 7/8" (tube size) BMX. Be aware that a 1" tube uses a 7/8" (22.2mm) actual quill size, which parts sites like to quote even though the size is always quoted based on the steerer tube.
Harris has a few in stock, although it may not have the rise you want:
http://sheldonbrown.com/harris/opc.html#stem