Right.
my corsa was a comfort. I drilled 2 holes one either side of the boot and fitted the spoiler like that. It is supposed to fit with 4 bolts, but i just used 2 as it was easier and fitted fine.
as already pointed out, my washer jet cums out from the top of the roof and is unaffected by the "rally" spoiler.
PPl with sxi models, u either have to drille thru ur sxi spoiler and fit the rally spoiler ontop (this looks bit **** in my opinion).
The other way u can do it, is just to remove the sxi spoiler and washer jet..... bolt the rally spoiler on , threu the 4 holes and then stick a rubber grommet in ur washer jet.
i orignally had an sxi spoiler fitted to my car ageeeees ago, soi had the washer jet disconnected from the washer bottle... after all, who needs one?