bolt pattern ?

[2fst4you]

what is the bolt pattern for a grand prix gtp is it the same as a grand am gt or differernt?

[99GrandAMSE]

99+ GA is 5 x 115 same as GP ... pre-99 are 5 x 100 :)

[55will87]

You could always do a search on google for the 5X115 bolt pattern and it will tell you all vehicles with the same bolt pattern. I did this and found out that bonnivilles have the same bolt pattern.

[99GrandAMSE]

... yes, they are but it is not only the bolt pattern that you have to be concerned with, but also the offset :)

[DomestikDemon]

And the hub clearance too.....depth I think it is?

[SE2000]

Since GM is the only one that uses 115mm, you don't have to worry about hub diameter as they are all the same. Offset is only an issue with some extreme wheels. I've run GP wheels on 1 GA and Olds wheels on the other.
The only issue is you cannot run wheels under 15". How large a wheel depends on how much you want to modify your car

[2fst4you]

so will the offset of the 18'' gxp wheels or the offset of the 17'' gt wheels be the same as a 03 grand am gts or close enough where u cant tell the difference