The stock oil fill (atleast the lbz-lmm) will not work. They are longer, maybe the lly will work, don't know. But I used a van oil fill. Only thing I don't care for is how thin the tube is. Takes a while to fill with oil.
I have an lb7 tube I am going to try. It really is annoying how slow it is filling with oil. Somebody should be porting the van oil fill tube lol.