This is dimensiones for your exhaust:
The difference between V1 and V2 for E36:
V2 diffuser just have another fins, they have more aggresive style. Both have white logo. Just have a look photos.
V3 LTW is smoller and lighter then V1 & V2, have a new style of fins. Fits on Sedan, Coupe, Touring. Need to drill one hole in a spare wheel plate.