you guys must be seeing something im not. the edge of the rims are almost even with the rear fender lip and your going to add a 20mm spacer? rolling the fender will give you maybe 5mm so the rim itself will stick out 15mm past the edge of the fender not even counting the tire.
the xfire has very low et settings and im not sure why you ordered the rims with such high et. adding the extra width of the rim isnt helping. before mounting them maybe a return and start over with different offsets? adding extra width on the rim changes the way the rim fits inside the wheelwell as opposed to the oem setting

btw if you want a hubcentric 5mm spacer buy a 10mm hubcentric spacer and have 5 mm machined off the back. im not sure if you see the upper control arm bolt in the front but adding 1/2" in width and huge et its very likely you will have issues with the bolt hitting the tire