I'm not exactly sure what Gabriel used for his e92 but I can tell you that H&R Sport Springs will give a very similar drop. Here are some more pictures of those wheels when they were sitting here at our shop!
Specs are:
F: 19 x 9.5 32ET; 255/35/19 Nitto Invo
R: 19 x 11.0 25ET; 305/30/19 Nitto Invo