Mine are 17x9.5 with 5 1/2" bs outside to outside of lip measures +/- 10 3/8".
The 15x8 with 3 5/8" bs outside to outside should measure about 9".
If you do the math they are going to stick out about 3/8" further than mine do. If your car sets low they will try to rub on the outside. If it sets high you may be able to make them work.
Before you buy them verify that they are unilug...if not they won't fit in the first place.
Here's the kicker that a lot of guys don't realize...the wheel width is measured from the inside lip where the tire bead sets to the other lip where the tire sets...not at the outside. If you measured these and they are 8" on the outside they will work since it is only really a 7" wide wheel.