You need to modify the bulks for XL cups. It can be done, just make the hole a bit bigger.
ps: long time ago that i posted something heren
Greetz,
Joram
OMG alrirght at least its fixalbe bcause after I bought them it said that the XL drive cups wont fit due to size. So I have to make the output holes on the bulks bigger? any suggestions in size drill bit?