pushrod length ball to cup

Yes I was worried this is the way and I will drive my car again in 8 months in spring 2015 ;-) This is worst case scenario for me.
I was hoping to base the length assuming that 8.575 was correct till my stock rockers bent.
Going from there I was thinking something like 8.300 area would be good.

Also if I get cup style adjusters on my rockers can I stay with my current pushrods, or change of pushrods is unavoidable?

If only I could get parts as easy as all you guys in USA and Canada...