There are four bolts holding the TC in place to the engine, they are located at the base of the TC(engine side). They have a short head, if you look at the engine side of the TC you shoud see one of them, note you will have to rotate the engine to find the next one and so on. Hope this helps.
The plate holding the TC is in the shape of a cross, i.e 4 bolting corners. If you look diresctly behind the TC you will see the heads of the bolts (very low in height. You will need a 17mm open ended spanner.
You will also have to rotate the tc to get at all the bolts in turn