It should fit, but it probably is an ATE caliper, don't know if your LS has Brembo or ATE calipers .
ATE's are natural aluminum color, Brembo's usually are black .
The brake pads are different between the two different calipers, you can 'modify' a Brembo brake pad back plate to work on an ATE caliper, but you can't make ATE pads work on a Brembo caliper .
I can post pictures later today to show the physical differences between the two calipers, if you like .