Hi, ForeignRS,

It is impossible to fit 4wd front spring in 2wd shock absorber without modification.
Reason is bottom spring cup is too hight on 2wd shock absorber.
Result : bad = front car is 100mm higher than normal level.

For your info, i had measured 2wd and 4wd serial springs
2 wd
free lenght : 390 mm diam. wire : 11 mm flexibility : 13 Newton / mm
4 wd
free lenght : 290 mm diam. wire : 15 mm flexibility : 40 Newton / mm

Regards.