The Missouri Meerschaum Regular Replacement stems are designed to fit any MM pipe which takes a 6mm filter, They're available in black or amber, bent or straight, and made of comfortable propionate plastic. They can be used with:
LEGEND
WASHINGTON
MISSOURI PRIDE
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Cheap and gets the job done. No complaints here.
They do not fit all of my "cobs", but, a small, sharp knife and a file or piece of sandpaper usually does the job.
Don.t think you can just get this as a spare for your pony...... you can change the look and feel of any of your non-filtered M.M.S