Comparing the MF curved arms va the straight arms, seems to me the straight ones are stronger.
Think compression & extension forces vs bending an arc.
Dave's comment on modding the OEM arms has merit: my Duster (sig pic) had the front leg widened about that amount by Jack Arnew back in the day.
Car goes straight as a string @ 130 at the track, runs about 7 deg pos caster.
Wheels remain vertical during wheelstands with no bump steer when it sets down.
Only side-effect is it self-centers aggressively, don't have your hand between the steering wheel spokes when it centers.
Depending on the combo, 3.5-5.0 works well on the street.