Hollander #62417 and 62416 rims

[bruce2]

I am looking at this set for my Q45. The result of my research turns out both are 18"x8", 5x114.3 mm and offset 30 mm. Can you confirm is these correct? So, why are the different part numbers for front and rear?
Also, do you think rims with 30 mm offset would look batter then 40 mm on my car? Thanks.

[bruce2]

I have this figured or guessed out. Tell me if I am wrong.

The different part numbers for the front and rear rims because most of the model and size are a bit wider on the rear which called stagger. However, their is an exception of the 18" rims which has the same width of 8" all around, but keeping the same tradition. Same goes for the rims for Infiniti G's