20mm wheel spacers

Standard wheels lowered, I can only get my hands on 20mm wheel spacers are these enough to fill out the arches??
 
25 is to much, 16mm gives the same stance as a set of 8j et55 ultraleggras which fill the arches. On a lowered car anything more will have you scrubbing the paint on the acrhes and whacking plastic!! Looks poo anyway.
 
from way back in the day...
H&R springs and H&R spacers compared to completely standard.
86-16.jpg
86-17.jpg
86-18.jpg
 
2cm difference... wow. look so much different (in relative terms). I'm hoping I can get my brother to machine my a set. They seem incredibly expensive for what they are.

It's not something you want to cheap out on though is it? I imagine yer wheels falling off will be inconvenient?

Remember the proper ones are all tested and relevant bolts etc included.
 
Where did people get their wheel spacers from? I'm looking for some 20mm ones for standard 197 wheels, preferably H&R.