| Position # | Description | JCI Name | Stepper Counts |
| 1 | Mirror | Mirror |
-2601 |
| 2 | Low Resolution 10um Grating | LowRes-10 |
-5362 |
| 3 | Low Resolution 20um Grating | LowRes-20 |
-8135 |
| 4 | High Resolution 10um Grating | HighRes-10 |
-11788 |
| 5 | High Resolution 20um Grating | HighRes-20 |
-14097 |
* All stepper counts must be confirmed thorugh final optical alignment.
Chris Packham; November 1st, 2005