IBM X23 - Manual (Page 116)

System
For X20, X21
1
3
5
6
8
13
11
12
17
14
10
15
16
9
7
4
1
2
18
No. FRU P/N
1 Hinge cover
SVGA Blacket 04P3162
XGA Blacket 04P3163
112 ThinkPad X20, X21, X22, X23, X24