Based on the research I've done for a steel front housing, any front 3rd member housing shall work. However, the Trackick housing will be aluminum and have a way of attaching to the frame. The Vitara model can be cast steel or aluminum and will have a different frame attachment. Both are said to be 7" ring gear diameter.
Zukipilot used a cast steel XL7 (Vitara model) 3rd member housing with his Anvil. There is an article in the article archive.