My question is I've got aftermarket rims 19s SAVINI WHEELSSize: 19x8.5(+2 Diameter) Offset: +45mm
will the Akebono fit good with my aftermarket rims or will I need to get spacers.

 

I would imagine that you would be fine. The G35 19x9 with 30mm work, I would expect that yours would as well.

 

Caliper clearance with wheels can vary from company to company despite having the same specs.
example:
Enkei RPF1 18x9.5 +38 won't clear Akebono
Gramlights 57CR 18x9.5 +38 will clear the calipers

only way would be to test fit it or try to find on the manufacture's website for clearance information. or reference other cars with large calipers and check clearance

 

Sometimes it's not the wheel clearance that you have to be concerned about, but the valve stem clearance if your wheel has a deep inner lip.

Unless someone with the same make/model wheels with the same specs chimes in with a solid answer, moving forward can be a leap of faith.

My front wheels are 19x8.5 +32 and the only way to get clearance was to use an aftermarket valve stem adapter, and then a 3mm spacer for peace of mind. It's tight.

 

@AQCE is there anyone else in your local area that already has the Akebono BBK on their car?
If so, see if they will let you mount one of your wheels on their car.
That way you would know what it would actually look like.

 

The spoke design can often be an issue as well.
Use these templates to measure the rims
https://conceptzperformance.com/imag...artemplate.pdf
https://conceptzperformance.com/imag...nttemplate.pdf