You have to make your own. Or at least that is all i have seen for CJ's
What i have seen done for this is a seperate cross member installed to suppot the tranny, then a skid plate installed on the frame to protect everything. Usually bolted through the sides of the frame rather than the bottom, to avoid bolt heads getting destroyed. This also allows for teh skid to be removed easily for tranny maintenance.
The reason they dont make them for CJ's I guess because
1 Cj drivers are cooler, and it is cooler when you custom build your own items
2. Therre are a lot more options for CJ tranny, T-case combintions than on any of the newer jeeps
-Paul