before i order these parts i was wondering how well they fit. looking to get a mugen style seibon carbon fiber front lip and si/tr style carbon fiber front grill -- how well do they bolt up?? will the lip be off by a certain amount of centimeters, inches, etc (or is that just a risk with after market body pieces)?? and the same goes for the grill?

also, im looking at procivic.com $288 for the lip and $168 for the grill...are those good prices or is there another site/shop that has better prices?