ls and gs bumper differences?

ok, i had an LS before and when it got wrecked I was parting out to a buddy of mine. and he had a GS and I noticed that the front lip didnt fit. why is that? and well this affect if I buy a kit? cause almost none ofthe placesI look say whether or not its GS or LS specific. thanks guys

no difference in model other than the painted moldings. The difference is in years, 90-91 & 92-93 are different. Both front and rear bumpers.

Model matters to painted mouldings, but GSs did not have painted ones AFAIK, only the LS-SE in 93 I believe.

The bottom of the bumpers is shorter on the 90-91 than the 92-93.

thanks guys