i think you're correct... to my knowledge Sennheiser does not sell the microphone head by itself.
Sorry - this is wrong - the head *is* available on its own - the MKHC 8050 - see my post above.
John: thanks for the correction!
...today i pulled the trigger on a pair of MKH8050 mics and hope to receive them by end of the month. i bought the normal configuration (head and XLR adapter) rather than head only.
NB: The MKH 8050 are not normally available as matched pairs as they are normally used as spot mics.
HOWEVER - Sennheiser can factory-match a pair on request and Germany do not charge extra for this.
Just make sure you make it clear to Sennheiser when you order, as they will have to be specially ordered from Germany.