I understand this is a common problem with the 1st generation LS. Especially 90-92. I was wondering if the rotors of a 94 LS would fit on a 91 LS? I've changed all 4 rotor on my wifes 91 LS and the vibration stopped for about 5 months. I know I'm not the only one with the problem. Please help. I have already had the rotors resurfaced which lasted another 5-6 months. Now it's starting again. HELP

 

I asked the same question a while back and the answer was no.

"Lvangundy" posted in the LS forums that he got aftermarket cross-drilled rotors for his '90 LS. You may want to check into that option. And they're cheaper than the OEM rotors too.