Easier to use a socket on them than the torx, think they were about a 17mm or something its easy'ish!!. Undo to the 2 bolts that hold the long metal thingamebob that is covered by a bit of plastic, this may need a lot of brute force, because they are exposed and have dirt on the thread, cracking and creeking when I forced mine out. Then its a bit tricky because of the closeness of the seat but you need to get to the bolt in with an extension and undo it, then I think they slide backwards and lift up. Simple but can be a b*****d if those bolts are dirty. Good luck.