The offset is F +27/ R +32. IIRC The rear should fit fine on the front, it's just comes out 5mm more. I'm actually using 3mm spacers on the front and rear of my Monolites with 245 R888. You could use 3mm on the rear.
F = 25
R = 32
25 to 28 seems to be the sweet spot for these cars in the front, but only because of wheel design. The flat-faced 17" Cup wheel works just fine at +38. Of course, it is an inch wider as well.
It's actually always been a sore spot with me that the front wheels seem to have more dish/offset/concave than the rears. Which is just the opposite of how people want it, and how the human eye wants to see it. Having them both 17x8 +32 looks MUCH better in my opinion.
The rear REALLY needs to be 17x9 +32 though, if I'm honest. It would fit a standard 245/40 with a perfect crown to match the front. However, Champion will not make the wheel in that size, unfortunately.
I'll be glad when these olden days are GONE and people can get whatever wheel they want in whatever size/offset they desire for a decent amount of money.
Those days are coming.