My wife loves her 2003 Bonneville but hates the seats. Is there any reason that the front seats from a 99 Seville won't bolt in fairly easily?

My experience with Cadillac in the 1996-2004 is that Cadillac does most of interior wiring, switches, etc different from other GM vehicles. I am guessing even if the mounts lined up, the electrical seat controls would not, you would likely have to custom wire it and no guarantee of success. You might be better off trying to find GXP seats. You don't mention the style of Bonneville you have. I have the 2001 SSEi seats and find them to be super comfortable.

I think the seats in the 00-02 bonnies were awesome I wonder why they changed the style in 03 to what looks to be the same seats out of the aurora i wish I could change the seats in my impala they suck big time

you wont be able to use the actual seat power motor assembly without some modification, but you should be able to use the seat cushions the will bolt up to the same holes just remeber the saets usually have the controls on the side so there will be a hole on the side where the controls will be

the aurora seats look the same to me...but i'm unsure also...i will give them a try when i mess up my gxp'* enough

As far as the impala...i heard a couple of people replace there out of the current gen impala with success

Thanks for the input everyone. I think I will have my wife sit in some more Bonneville seats before doing amything drastic. Sounds like they made quite a variety of them.