[Dragsinger]

M, you have several choices.

* S-10 manual box [with the S-10 box in most cases it is a direct replacement. Input spline & pitman spline same as OE. It will have a four bolt top]

* manual GM box from 70's cars [this is also a direct fit in some cases. GM produced several spline counts so it takes some comparing to find the exact match. This is a three bolt top. This box is about one pound lighter than the S-10 box and overall slightly smaller.

* Vega box [this box is smaller and lighter than both the above, however, it requires a custom/special pitman arm. Ed Quay, Flaming River, and maybe others furnish the special arm.

Of the three, I would look for the 70's box.