i'd be surprised if a 3.3 could pull 5th gear on a T5 even at 100kmh with 2.92 diff gears it probably has. T5 has a 0.72 ratio 5th,
the 3.3 XE 5 speed (rubbish one same as a sigma used) had a 0.85 ratio 5th.
You need to modify the XD gear box cross member for the T5 to bolt in.
The XF gear box cross member dont fit, they are to short.
Ive got pics some where of it but cant find them right now.
Think of an EA gear box cross member with XD cross member ends welded to it and presto.
You need a pedal box of cause and the small clutch cable support that bolts to the firewall,
yours being an auto has a blanking plate over the hole.
Clutch and a cable and you should be right.
Oh yeah and as polson says you need a bell housing off a XF T5.