i just measured them up and went and bought some 8.8 grade bolts with appropriate lengths and so on, m16 by about 110mm iirc, tis easy though just stick a tape on it and see what you need, i took the new bushes with me to the local n&b shop so i knew they were the right size, both width and length, its a 24mm socket so i think that means its a 16mm bolt.Dont forget the shaft of the bolt should be smooth ie have a long shoulder that sits inside the bush, not threaded all the way along.