Someone else has dibbs on the bars, i replied to them but haven't heard from them in a week.
In light of this post, I'll give them till the weekend and if i don't hear from them, the oem bars and levers could be yours. Let me know if that works for you.
I can tell you that an S1 header will not fit an S2 oil pan (without modding pan or header), but I think you **might be able to*** go the other way around. However, having not tried it, I would be hesitant to get your hopes up. It will bolt to the engine just fine. Its how the header collector fits that is the issue.
I bought it as backup plan in case the S1 header to the S2 chassis was a no go. I ended up grinding this bump off the S2 oil pan and welding up the hole and the S2 pan can be made to fit S2 CAT free header.