hks coilover knocking

[moses]

have spent the last few weeks chasing a very irritating knock in the front of my altezza with hks hyper-d coilovers, it only realy knocks at low speeds over small bumps it started in the right front but now the left side has joined the party. ive been over all the bushes replaced upper and lower ball joints both sides and have checked the pressures in both coilovers they have roughly 15psi but am still chasing this knock. Ive also had the right front out and removed the top hat to see if there was any play in the pillow ball it seems good couldn't feel any play but it didn't move very freely. anybody have any thoughts on this or know where to get replacement pillow balls so I can eliminate that? any help would be much appreciated

[Mr Ree]

Is there any chance that it is the sway bar end links?

[moses]

have replaced link rods and the mounting bushes were replaced not long ago