I saw VW body kit for 99-up it is cool . Do someone knows that I could use it on my 1996 Audi A4?

First of all, you posted this in a TECHNICAL forum even thouhg an inch below where you clicked to post this, there was one for "exterior/bodykits". Secondly this is a honda forum. You need to go to the Audi forums Heres a link ot the A4 forum (http://www.automotiveforums.com/vbulletin/forumdisplay.php?f=80)
Youll have beter luck there

highly doubtful that they would fit. even tho they are both produced by VW.