Its all the same as putting sigmas in an 86.
If your using stock sigma bushes they need to be cut down about 2mm either side of the bush for them to fit in to the cross member.
I dont think 86/70/71 ball joints fit in the sigma arms.
RA40 steering tubes and tie rods need to be used.
Sway bar hole dont need to be drilled but they will be on abit of a leen.
Same with the castor rod bolt holes no drilling needed. You may just have to loosen off the adjustment at the front to get them in.
Craig
