Used ,but thread checked with speedo cable and cleaned-if you have ruined the thread or lost this alloy housing, this is a cheap replacement.
You need to purchase a new seal, see
AAU2304.
The gasket for this is
GUG705565GM.
The retaining stiffener clip is
22A862.
Remenber-these are anywhere from about 25-50 years old.New one are not available