Discontinued, no longer available.  Use 9-C0975-90-0-6 as replacement. 

Replacement part for American style keyed cylinder with flat tail piece

Door Thickness: 2-1/4 inch (57mm)
Length: 2-1/2 inch (64mm) long.
Break away score marks at 3/8 inch, then 1/4 inch increments for thinner doors

Installation Note:
Screws off cylinder cap for replacement.
Connect from cylinder to thumb turn
Replace screw on cap
1. If key turns hard, the cap is to tight
2. If the key will not come out, the cap is too loose