That is the fastback top. When the D-90's first cam eot the states they came standard with only the diagonal braces, the full "safari cage" as it is referred to was an additional option. The fastback top will only work if you take the back half of the cage off. If you don't want to do that you need to buy a full top. The fastback top should sell quickly as their always seems to be a couple of people looknig for one.
Hope this answers your question!
If the truck makes it - the trail wasn't tough enough.
If the truck doesn't make it - the truck wasn't tough enough.