Conti DSW HELP!!!

[Z Monster]

So i was on tire rack and i had trouble finding the correct size tire of continental extreme contact for my nismo rims.

I could not find 245/40/19 which is recommended for the front nismo rims but
I did find 245/35/19 instead of the 40 aspect ratio.
I did also find the rear tire at 285/35/19 which i will be getting.

My question is regarding the front tire aspect ratio. Should I get 245/35/19? OR 245/45/19 for the front? Please keep in mind I will be putting in swift spec-R springs that will drop my car about an inch. Is it ok if ran 245/35/19 and 285/35/19 with those springs? or do you think more meat in the front would be much better get the 45 aspect ratio?

Im really bummed out that they dont have 245/40/19 for the front tires. Its either i go up 5 or down 5 for the height. Has anyone ran 35 aspect ratio for front and back?

Thanks a lot guys