Check the hinge pins by letting them roll slowly along a piece of glass or a mirror, any slight deformity will show up far easier.
Does the suspension on those use 'quik clips' or similar?
It might be that the end of the A arm is being pinched between the pivot blocks, might require some filing to be done to the A arm.
Xray T4'16, T4'14 (Wet Car)
Xray X12 2016
wlrc.co.uk (West London Racing Centre)