manual steering box

Hi guys ...need some direction on the correct rebuild kit for a bullet shaped manual steering box out of my 72 duster. Also where I can find instructions with an exploded view would be great....thanks
Firm Feel has rebuild kits. When I rebuilt mine I installed one of their 20:1 ratio worm gears.
The FSM has info on rebuilding. Also do a search here on FABO, there is a post with photos and good detail. There are also posts on what lube to put back in. I use the Mobil 1 red synthetic grease.