| Part Number | Description | Spacing |
|---|---|---|
| GSD A | One .34 inch slot | n.a. |
| GSD B | One .38 inch slot | n.a. |
| GSD C | Two .34 inch slots | .75 inch |
| GSD D | Three .34 inch slots | .50 inch |
| GSD E | Three .41 inch slots | .75 inch |
| GSD F | Three .56 inch slots | 1.00 inch |
| GSD G | Four .56 inch slots | 1.00 inch |
| GSD H | Five .56 inch slots | 1.00 inch |
| GSD J | Six .56 inch slots | 1.00 inch |
| GSD K | Three .56 inch slots | 1.00 inch |