[QUOTE=Deuce]The different widths are just a widened crossmember ... the A arms are still the same short little length Ford designed for Pinto over 30 years ago.
Deuce makes some very good points regarding the weight of the vehicle, etc. (I didn't realize just how large that car is!). However, just to clarify the above statement; the a-arms in these aftermarket kits are NOT the same as the 30-year old stampings. They are much beefier tube-type a-arms. Using these in conjuction with strut rods should be fine for just about any passenger vehicle.
Give a call to Jim Meyer Racing, I'm sure they can design a custom (and safe) IFS for the LaSalle.