hi jason, ive done a conversion on my 75 using early 156 gta calipers, the ones to match 310mm discs. but i went for the bigger 330mm discs, hey, bigger the better. i had the brackets made by a friend of keith waite of K&L autos using aero grade ali (which is a must apparently). i also used drilled discs fitted behind the hub instead of infront and installed longer studs fitted in an ali ring. i have got some pics but i dont know how to decrease the size of them and get rollocked everytime i post them. if you need other info let me know. cheers steve.