Wing, will a 'universal'...fit easily? Options

[Griff]

i have this wing that i like, and with the kit im planning on putting on my car, it will look nice...
it is a mustang cobra wing

http://www.extremedimensions.com/6613.html

now, im NOT a mustang guy at all, but this would go with my style...so i guess if the wing counts, i am a very slight mustang guy...anyway..

the link has the pic, and its supposedly universal, our backs are a lil curved, and the stangs usually are a little more level than ours, now it being universal i am curious, is it easy to modify it to fit our slight curve?and possibly shorten it a little? is this worth it? could i pay a shop to modify it and install

im assuming its not so universal...
and input by someone who actually knows whats going on would be great, thanks