Rallyes-New vs OEM

Couple of questions about new SBP Rallyes and OEM.

1) What width/back set were available from factory?

I am looking at possibly 8" for rear with 235/60/14 and possibly 5.5" or 6" on front with possibly 195/70/14 front.

2) Are there any issues with wheel strength, flexing, trim rings coming off under hard acceleration etc.

3) Would trim rings and caps like the ones that Coker sells fit OEM wheels?

Thanks
On what car? I don't think I have heard of any issues with 6" on the front along as you don't use too tall of a tire. 7" wide with 4-4.5" backspace work on Darts and Scamps but they are very close. I have only known acoupke guts that use 8" on the rear of those cars but they did have to do some fender lip trimming and rolling.
Trim rings coming off aren't an issue as long as you don't drive it sideways like you stole it.

Aftermarket rings and center caps should work fine on stock wheels.