Battery Tray Bracket - Jack Hardware?

[tucsonjwt]

Does anyone know the function of this bracket on the battery tray for my 83 C20? I assume that is has something to do with the jack which is supposed to mount nearby. I am planning on installing the factory jack on the inner fender, so any pics of how this attaches would be appreciated. I am not sure that the picture shows the proper location for this bracket (with two captive nuts) or if it just ended up there by chance. Pics on the whole jack installation for an 83 would be helpful also. Thanks.