Forgeline SO3S VS SO3P

[Bob Waters]

I have been searching through the old posts/threads and found the wheel I really like. The Forgeline premier SO3S. There are lots of pics of this wheel years back on this site and other sites in 18". I really like the step lip. The ones I saw were 18" and now I only see 19" in the step lip. Am I correct to think the step lip will give more rigidity to the wheel rim? The SO3P is nice but at the price I am looking for exactly what I want and that is an 18". The wheels will be going on a 1970 Camaro. 18x10 front and 18x12 rear.