lowering springs eibach

I bought BBk Caster Camber plates for my Eibach R1 coil over kit to find that the plates are manufactured to take the stock springs, (see attached). If anybody has any ideas on how to work around this complication i'd want to hear them. If its not possible, are there other options for plates...

I have a 2002 GT 5 speed, just got it not long ago. The first time I washed it I thought I might have gotten water in my cat backs. I started it up and started driving, ran like crap. I could feel it shaking, like it was missing a cylinder. Ran crappy through every gear up untill about 3,500...

I just wanna know if it is hard to install eibach lowering springs on a 2007 mustang gt. ive done alot of research and it seems pretty straight forward, any obstacles i should know about? and does anyone have a VIDEO of how to do it??? all ive found is pictures...just wanna get it done safely...