This item listing is to purchase JUST the 1538963 ~ 26B-SQL200LP  cap.
Note: If the cap is missing, additional parts that go into the cap are also missing and must be ordered separately: 
(1) 
1125768 ~ 26F-525MAG2 Inner Spool Tension Ratchet Washer
(1) 
1125769 ~ 26D-525MAG2 Spool Tension Click Spring
(1) 
1452776 ~ 40C-SQL200LP Hard Fiber Friction Thrust Washer
(1) 
1125771 ~ 40D-525MAG2 Black Rubber Thrust Washer
(1) 
1452777 ~ 26G-SQL200LP Outer Spool Tension Ratchet Washer
(1) 
1538963 ~ 26B-SQL200LP Spool Tension Control Cap
(1) 
1490799 ~ 120-SQL200LP Clear Rubber O-Ring
If all the parts are missing, you can order a cap kit with all the parts included -- linked below in related products.
Again, the screen you are currently in is to order JUST a cap.
SPOOL TENSION CONTROL CAP : ORIGINAL SCHEMATIC KEY NUMBERS
 [ Key # 69 ] - SQL200LP
 [ Key # 69 ] - SQL200LPHS
 [ Key # 69 ] - SQL200LPLH
 [ Key # 65 ] - SQL300LP
 [ Key # 65 ] - SQL300LPHS
 [ Key # 65 ] - SQL300LPLH