OK so I just purchased some new 20'rims for my 04 grand prix gt2. I did my home work on the bolt pattern and made sure they would fit. I seen where ppl have said that 5x114.3 would fit. What i didnt pay attention to was the offset? I dont even know what the offset means. This is the info on the rims that I bought. Going on a 04 grand prix gt2

20" Gianna G1 Blitz Rims

5x114.3

5x4.5

Offset 35-55mm

Tires: 245/45/20 <--- Only 2 tires came with the rims so I am looking to put all new 245/35/20 on them.

If anybody can tell me these will fit my car and Ill be good to go I would appreciate it. Also the best tire size that I shoudl go for. I like the low profile look. If they wont fit then Ill just have to sell them and find some that do. But i really love the look of these things.